uboot-phytec

MLK-23964-1 video: Add video link framework

The video link framework bases a port-endpoint gragh in DTB to
connect the video components in uclass like: video, display, bridge,
and panel.

Using the port-endpoint gragh, we manage multiple video link and
user can select one of them for splash screen.

Signed-off-by: Ye Li <ye.li@nxp.com>
(cherry picked from commit d6e6b1293f89b8a26033ac2f82151985f70e4036)