disp: msm: sde: expose dnsc_blur connector properties

Add downscale blur connector properties to expose the hw block count,
downscaling filters used and the ratios supported. Add a custom dnsc_blur
property to allow usermode to send the required configuration to program
the hardware. Expose only for the virtual connector as the dnsc_blur is
only supported with writeback block.

Change-Id: I35dd263d9d5aafdb59bacbb3a0528ffd2bcaf6a3
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>

msm/msm_drv.h

@@ -200,6 +200,7 @@ enum msm_mdp_conn_property {
 	CONNECTOR_PROP_HDR_METADATA,
 	CONNECTOR_PROP_DEMURA_PANEL_ID,
 	CONNECTOR_PROP_DIMMING_BL_LUT,
+	CONNECTOR_PROP_DNSC_BLUR,
 
 	/* # of blob properties */
 	CONNECTOR_PROP_BLOBCOUNT,