Add GPU drivers and Weston

- Import wayland-protocols and weston debian packaging files from
upstream, and tweak to work with the -imx trees
- Add configuration for an arm64 docker container to build weston in
- Make the rootfs dependent on
imx-gpu-viv/wayland-protocols-imx/weston-imx deb packages
- Swap xorg for xwayland in the rootfs, and add a few extra packages

Change-Id: I0be6a6f6f86d619ae4475653a46af3376c1a8b1f
20 files changed