LF-4506-2: drm: bridge: cdns_hdmi: save new connector state

commit e042961238260a79713d6ee11f4151394e740772 from
https://github.com/nxp-imx/linux-imx

Colorspace connector property is use to choose the right output colorspace
in mode_fixup.
The current state pointer is not updated and incorrect output colorspace
will be selected in mode_fixup.

Save new connector state to struct cdns_mhdp_device and use the new
state to select correct output colorspace.

Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
Reviewed-by: Laurentiu Palcu <laurentiu.palcu@oss.nxp.com>
Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com>