board: rockchip: add DSI and DSI-DPHY for Anbernic RGxx3

Add support for the DSI and DSI-DPHY to U-Boot for the RGxx3. These are
needed so we can send a panel ID request to determine which panel is
being used.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
1 file changed