drm/i915: Do not program aux plane offsets on gen11+

The PLANE_AUX_OFFSET mmio does not exist on ICL, do not program it.  We'll
still calculate the aux offset as it is required for adjusing x-y offsets.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181026193805.11077-2-dhinakaran.pandiyan@intel.com

drivers/gpu/drm/i915/intel_sprite.c

@@ -414,6 +414,8 @@ skl_program_plane(struct intel_plane *plane,
 	I915_WRITE_FW(PLANE_SIZE(pipe, plane_id), (src_h << 16) | src_w);
 	I915_WRITE_FW(PLANE_AUX_DIST(pipe, plane_id),
 		      (plane_state->color_plane[1].offset - surf_addr) | aux_stride);
+
+	if (INTEL_GEN(dev_priv) < 11)
 		I915_WRITE_FW(PLANE_AUX_OFFSET(pipe, plane_id),
 			      (plane_state->color_plane[1].y << 16) |
 			       plane_state->color_plane[1].x);