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Be consistent in that active_planes bitmask fits in a u8.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210514125751.17075-4-ville.syrjala@linux.intel.com

Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>