Documentation,drivers/aie: align machine learning docs with current code

[Abhishekmishra2808]

Summary

tflm_tool.cc registers nine operators including DEPTHWISE_CONV_2D, but the docs still said eight. The same page described tflm -C as a real compile path even though NuttX never defines TFLITE_MODEL_COMPILER, and it mixed the on-target no-heap TFLM model with the sim helper that uses ifstream / new.

This change also records the pinned TFLM / CMSIS / CMSIS-NN / NNABLA / Darknet versions, notes that CMSIS 5 is archived and that CMake only builds tflite-micro and cmsis-nn, adds the missing gemmlowp / KissFFT / Ruy / FlatBuffers pages, documents the kernel AI-engine character driver, adds drivers/aie to CMake, and fixes the aie_register() header comment plus SPDX.

No nuttx-apps change. Depends on current apache/nuttx-apps master (DEPTHWISE already merged).

Impact

Docs-only for applications and drivers, plus a small unused-driver build fix:

• HTML docs now match tflm_tool.cc and the current Kconfig/Makefile pins
• CONFIG_AI_ENGINE builds under CMake the same way it already did with Make
• No runtime or API change for boards that do not enable CONFIG_AI_ENGINE (none in-tree do)

Testing

Host: Linux WSL2 x86_64, gcc 13.3.0, Python 3.11.9, Sphinx 6.2.1
Target: docs + style only (no board image)

1. checkpatch / nxstyle

$ ./tools/checkpatch.sh -g HEAD
✔️ All checks pass.
$ ./tools/nxstyle include/nuttx/aie/ai_engine.h
$ echo $?
0
$ ./tools/nxstyle drivers/aie/CMakeLists.txt
$ echo $?
0

2. Docs vs tflm_tool.cc

tflm_tool.cc resolver:
resolver.AddConv2D();
resolver.AddDepthwiseConv2D();
resolver.AddMaxPool2D();
resolver.AddQuantize();
resolver.AddDequantize();
resolver.AddMean();
resolver.AddReshape();
resolver.AddFullyConnected();
resolver.AddSoftmax();
docs nine-ops mention: True
docs DEPTHWISE_CONV_2D: True
docs eight leftover: False

3. Sphinx HTML (-W, warnings as errors)

$ cd Documentation
$ sphinx-build -j auto -W -b html . _build/html
Running Sphinx v6.2.1
building [html]: targets for 1736 source files that are out of date
updating environment: [new config] 1739 added, 0 changed, 0 removed
...
build succeeded.
The HTML pages are in _build/html.
Generated pages present:

OK  applications/mlearning/tflite-micro/index.html
OK  applications/mlearning/index.html
OK  applications/math/gemmlowp/index.html
OK  applications/math/kissfft/index.html
OK  applications/math/ruy/index.html
OK  applications/system/flatbuffers/index.html
OK  components/drivers/character/aie.html

[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