board/MynaPlayer odyssey: only copy machine-id into the target with postbuild scripts. Use a device table file to alter its permissions later -- this avoids getting a permission denied error if you have to run the postbuild script multiple times e.g: build errors with trying multiple fixes.

{Config, board/MynaPlayer odyssey: change kernel compression to lz4 and initramfs compression to none.

Config: configs/myna_player_odyssey_defconfig: remove unneeded firmwares.

Initial commit.