drm/bridge: Add ITE IT6263 LVDS to HDMI transmitter support

commit 530317c49af8a88afbf578ac8c3c072af83cfc49 from
https://github.com/nxp-imx/linux-imx



ITE IT6263 is a LVDS to HDMI transmitter.
This patch adds IT6263 video support.

Signed-off-by: Liu Ying <victor.liu@nxp.com>
[ Liu Ying: Squash a build fix due to rebase upon v5.19-rc7 ]
Signed-off-by: Liu Ying <victor.liu@nxp.com>
[ Liu Ying: Squash a change to make it6263_remove() return void ]
Signed-off-by: Liu Ying <victor.liu@nxp.com>
Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com>