drm/i915: kill STANDARD/CURSOR plane screams

Stop yelling the plane type. "STANDARD" doesn't mean anything anyway.
Let's just use the plane name here.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1464371966-15190-8-git-send-email-ville.syrjala@linux.intel.com


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