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snb supports fp16 pixel formats on the sprite planes. Expose that
capability. Nothing special needs to be done, it just works.

v2: Rebase on top of icl fp16
    Split snb+ sprite bits into a separate patch
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191015193035.25982-11-ville.syrjala@linux.intel.com