Manage the Seeed Xiao nRF52840 Mbed-OS boards

The Seeed Xiao nRF52840 Mbed-OS platform includes two boards: the Xiao nRF52840 and the Xiao nRF52840 Sense with additional sensors.

Warning

The software for the Seeed Xiao nRF51840 board is not stable enough. Support has been put on hold.