NuttX board build not needed (#8029)

nuttx-configs/esc35-v1/src/Makefile

nuttx-configs/esc35-v1/src/ostubs.c

nuttx-configs/px4cannode-v1/src/Makefile

nuttx-configs/px4cannode-v1/src/ostubs.c

nuttx-configs/px4esc-v1/src/Makefile

nuttx-configs/px4esc-v1/src/ostubs.c

nuttx-configs/px4flow-v2/src/Makefile

nuttx-configs/px4flow-v2/src/ostubs.c

nuttx-configs/s2740vc-v1/src/Makefile

nuttx-configs/s2740vc-v1/src/ostubs.c

nuttx-configs/zubaxgnss-v1/src/Makefile

nuttx-configs/zubaxgnss-v1/src/ostubs.c

platforms/nuttx/NuttX/CMakeLists.txt

src/firmware/nuttx/CMakeLists.txt