MLK-18104: drm: imx: dcss: Fix brightness on some HDMI 1.4 ports

MLK-18104: drm: imx: dcss: Fix brightness on some HDMI 1.4 ports

Some HDR TVs have multiple HDMI ports but only one of them is HDMI 2.0
compliant, hence HDR capable. The rest are HDMI 1.4.

The HDMI 1.4 ports' supported colorimetry is only REC.709 and REC.601.
However, the supported EOTF in HDR metadata block can be BT.2084 which
should be matched with REC.2020.

This patch makes sure that BT2084 is used only if colorimetry supports
REC.2020. Otherwise, REC.709 will be used.

Additionally, change a message from info to debug. No need for it to
show up all the time.

Signed-off-by: Laurentiu Palcu <laurentiu.palcu@nxp.com>