disp: msm: sde: add checks for hfc feature enablement of demura

HFC feature of demura needs a skip blend plane to be set. If skip blend
plane is not set and HFC feature is requested to be enabled, driver
should skip turning on HFC demura feature. Change adds checks to ensure
that HFC is always enabled with skip blend plane staged.

Change-Id: I923359c7cb143867660b4c1e667f56ed42fa51c9

msm/sde/sde_hw_mdss.h

@@ -584,6 +584,10 @@ struct sde_mdss_color {
  *			using LUTDMA
  * @panel_height: height of display panel in pixels.
  * @panel_width: width of display panel in pixels.
+ * @valid_skip_blend_plane: true if skip plane params are valid
+ * @skip_blend_plane: plane which has been skipped staging into layer mixer
+ * @skip_blend_plane_w: skip plane width
+ * @skip_blend_plane_h: skip plane height
  */
 struct sde_hw_cp_cfg {
 	void *payload;
@@ -598,6 +602,10 @@ struct sde_hw_cp_cfg {
 	bool broadcast_disabled;
 	u32 panel_height;
 	u32 panel_width;
+	bool valid_skip_blend_plane;
+	enum sde_sspp skip_blend_plane;
+	u32 skip_blend_plane_w;
+	u32 skip_blend_plane_h;
 };
 
 /**