Adding USVCAN bootloader support

Tools/files_to_check_code_style.sh

Tools/make_can_boot_descriptor.py

cmake/configs/uavcan_board_ident/esc35-v1.cmake

cmake/configs/uavcan_board_ident/px4cannode-v1.cmake

cmake/configs/uavcan_board_ident/px4esc-v1.cmake

cmake/configs/uavcan_board_ident/px4flow-v2.cmake

cmake/configs/uavcan_board_ident/s2740vc-v1.cmake

cmake/configs/uavcan_board_ident/zubaxgnss-v1.cmake

cmake/nuttx/builtin_commands.c.in

src/drivers/bootloaders/include/bitminip.h

src/drivers/bootloaders/include/blsched.h

src/drivers/bootloaders/include/board.h

src/drivers/bootloaders/include/boot_app_shared.h

src/drivers/bootloaders/include/can.h

src/drivers/bootloaders/include/crc.h

src/drivers/bootloaders/include/flash.h

src/drivers/bootloaders/include/random.h

src/drivers/bootloaders/include/timer.h

src/drivers/bootloaders/include/uavcan.h

src/drivers/bootloaders/include/uavcan_can_id_defs.h