drm/drm_plane: track color mgmt changes per plane

We will add color mgmt properties to DRM planes in the next patches and
we want to track when one of this properties change to define atomic
commit behaviors. Using a similar approach from CRTC color props, we set
a color_mgmt_changed boolean whenever a plane color prop changes.

Reviewed-by: Harry Wentland <[email protected]>
Signed-off-by: Melissa Wen <[email protected]>
Acked-by: Maxime Ripard <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

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