boards: xtensa: m5stack_atom_lite: initial support

Source code of board/m5stack/m5stickc_plus and
board/m5stack/m5stack_atoms3_lite were adapted for an inital
support of the M5Stack ATOM Lite board.

Signed-off-by: Nikola Trifunovic <nikola@trifunovic.at>
14 files changed