board/MynaPlayer odyssey: added pivot_root from util-linux.

board/MynaPlayer odyssey: add kernel image and device tree to the target via buildroot.

board/MynaPlayer odyssey: Make ATF much less verbose.

board/MynaPlayer odyssey: removed initramfs. ...

This build no longer requires an initramfs. It has hence been removed entirely. The associated defconfig is deleted, as are the postbuild and postimage scripts and overlays. The patches have been relocated to the rootfs_patches directory. Also worth noting is that the machine-id setup is entirely gone from the build system.

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.