imx8mq-evk has a MIPI DSI port that can be used to connect a Raydium
RM67191 panel.

Add support for it.
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Acked-by: Guido Günther <agx@sigxcpu.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>