MLK-17275-7 drm/bridge: adv7511: Add dsi-channel property

commit c810811e5d30c0b1ad1a5f3f2da0c20398228680 from
https://github.com/nxp-imx/linux-imx



Add a new property "adi,dsi-channel" to allow the user specify the DSI
channel to be used when communicating with DSI peripheral.

Signed-off-by: Robert Chiras <robert.chiras@nxp.com>
Reviewed-by: Laurentiu Palcu <laurentiu.palcu@nxp.com>
[ Aisheng: change to yaml ]
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com>