arch/arm/n32h7: Add N32H762IIL7 BSP with USBHS, SDMMC, CORDIC and CMake preset helper

[Felix-LJY]

Summary

This PR adds a complete Board Support Package (BSP) for the
N32H762IIL7 (ARM Cortex-M7 @ 600MHz) from Nations Technologies,
including chip-level and board-level support, peripheral drivers,
documentation, and a CMake preset helper for VS Code users.

The port is a from-scratch implementation based solely on the
manufacturer's reference manual (TRM). No proprietary SDK code is
used.

Functional areas affected:
arch/arm/src/n32h7/ (new chip support)
arch/arm/include/n32h7/ (new header files)
boards/arm/n32h7/n32h762iil7/ (new board support)
Documentation/platforms/arm/n32h7/ (new documentation)
tools/generate_cmake_presets.py (new helper script)
CMakeLists.txt (small integration)

Completed drivers:
GPIO, EXTI, RCC, UART (console), TIM, PWM, ONESHOT, TICKLESS,
DMA, FLASH (MTD), CAPTURE, USBHS (Device and Host), CORDIC,
SDMMC (ADMA2, FATFS verified), UID, WDT, RTC.

Not yet ported:
I2C, SPI, ADC, DAC, CAN/FDCAN, ETH.

References:
Initial mailing list announcement:
https://www.mail-archive.com/dev@nuttx.apache.org/msg14861.html

Follow-up mailing list thread:
https://www.mail-archive.com/dev@nuttx.apache.org/msg15060.html

Impact

Is new feature added? YES - Adds support for a new SoC (N32H7) and
a new board (N32H762IIL7).

Impact on user? NO - Existing boards are unaffected. The new port
is self-contained under arch/arm/src/n32h7/ and boards/arm/n32h7/.

Impact on build? YES (minor) - A new Python script
(tools/generate_cmake_presets.py) and a small integration in the
root CMakeLists.txt are added. The script only runs if
generated_board_presets.json is missing, and it does not affect
existing build flows. Users who prefer to pass -DBOARD_CONFIG=...
manually are unaffected.

Impact on hardware? YES - A new architecture family (N32H7) and a
new board (N32H762IIL7) are added. No existing architecture or
board is modified.

Impact on documentation? YES - New documentation is added under
Documentation/platforms/arm/n32h7/:
- index.rst (chip family and peripheral support)
- boards/n32h762iil7/index.rst (board features, pin mapping,
building, flashing, configurations)

Impact on security? NO - No security-relevant changes.

Impact on compatibility? NO - Existing boards and configurations
are unaffected.

Testing

Build Host(s):

• OS: Ubuntu Linux
• CPU: x86_64 (AMD)
• Compiler: GCC (ARM GNU Toolchain 15+) and Clang (ATfE 19+)

Target(s):

• Arch: ARM (Cortex-M7)
• Board: n32h762iil7:nsh

Verification steps:

1. Configure and build:
   ./tools/configure.sh n32h762iil7:nsh
   make -j$(nproc)
2. Flash and boot on real hardware (N32H762IIL7 dev board via
   J-Link + Ozone).
3. Run ostest - all tests PASSED.
4. Run benchmarks: coremark, mtd, sdbench, ramspeed, osperf,
   pi_css5.
5. Verify FATFS on SD card and MTD on SIP Flash.

Testing logs after change (summary):

NuttX 13.0.1 98d7392 arm n32h762iil7

CoreMark 1.0 : 2358.861456 (3.93 CoreMark/MHz)
MTD Flash (/dev/mtd0):
Write: 1689.77 KiB/s | Read: 22755.56 KiB/s | Verification: PASSED
SDMMC (sdbench, block size 4096):
Sequential Write: 1423.2 KB/s | Sequential Read: 4728.1 KB/s
ostest: All tests PASSED
ramspeed: memcpy/memset bandwidth validated
pi_css5: 32768 digits of PI in 0.72 seconds (verified on FATFS)

The full terminal log (boot, ostest, CoreMark, mtd, sdbench,
ramspeed, osperf, pi_css5) is available in the board documentation
and in the commit message of 17b9602.

PR verification Self-Check

[x] This PR introduces only one functional change.
[x] I have updated all required description fields above.
[x] My PR adheres to Contributing Guidelines and Documentation.
[ ] My PR is still work in progress (not ready for review).
[x] My PR is ready for review and can be safely merged.

[github-actions]

MemBrowse Memory Report

No memory changes detected for:

• arduino-mega2560
• esp32-devkitc
• hifive1-revb
• mirtoo
• qemu-armv8a
• qemu-intel64
• rx65n-rsk2mb
• s698pm-dkit
• stm32-nucleo-f103rb

[xiaoxiang781216]

@Felix-LJY please squash your change into one patch or organize your patch into individual driver and remove the temp change.

[Felix-LJY]

@Felix-LJY please squash your change into one patch or organize your patch into individual driver and remove the temp change.

@xiaoxiang781216
Thank you for the review!

I have:

• Fixed all checkpatch errors.
• Squashed all changes into a single commit.
• Removed all temporary/debug changes.
• Verified the build and runtime tests again on hardware.

I would appreciate any further feedback when you have time.