Changes to px4fmu-v2 for upstream Nuttx and hardfault logging

cmake/configs/nuttx_px4fmu-v2_default.cmake

cmake/configs/nuttx_px4fmu-v2_test.cmake

nuttx-configs/px4fmu-v2/Kconfig

nuttx-configs/px4fmu-v2/include/board.h

nuttx-configs/px4fmu-v2/nsh/Make.defs

nuttx-configs/px4fmu-v2/nsh/appconfig

nuttx-configs/px4fmu-v2/nsh/defconfig

nuttx-configs/px4fmu-v2/nsh/setenv.sh

nuttx-configs/px4fmu-v2/scripts/ld.script

nuttx-configs/px4fmu-v2/src/Makefile

src/drivers/boards/px4fmu-v2/board_config.h

src/drivers/boards/px4fmu-v2/px4fmu2_init.c

src/drivers/boards/px4fmu-v2/px4fmu2_led.c

src/drivers/boards/px4fmu-v2/px4fmu_can.c

src/drivers/boards/px4fmu-v2/px4fmu_spi.c

src/drivers/boards/px4fmu-v2/px4fmu_usb.c