drm/i915: s/intel_state/state/ in intel_{prepare,cleanup}_plane_fb()

Drop the redundant intel_ prefix from our atomic state variable.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200110183228.8199-4-ville.syrjala@linux.intel.com


Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>