MLK-17655: drm: imx: hdp: send HDR metadata when property is set

MLK-17655: drm: imx: hdp: send HDR metadata when property is set

HDR metadata infoframe was sent only when doing a mode set. However,
kmssink is using the same device as Weston and mode setting messes up
with Weston's plane state.

This patch allows for the HDR metadata to be sent out to the sink when
the property is set. Hence, no need for a mode set.

Also, the older functionality allowed only for 4K@60 to be used for HDR.
However, HDR is not about resolution. This patch will also allow to go
to HDR mode in other resolutions as well.

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