disp: msm: add support for seamless dsc switch

This change adds logic to determine dsc switch based on
the connector property "CONNECTOR_PROP_DSC_MODE" and
performs seamless DSC switch if there is any change in
DSC configuration. The connector property is populated
in msm_sub_mode based on which suitable mode is selected.

Change-Id: Ifc4931f16dfb814781bc1d72b103e09103e6bfee
Signed-off-by: Yashwanth <yvulapu@codeaurora.org>

msm/msm_kms.h

@@ -295,6 +295,9 @@ static inline bool msm_is_private_mode_changed(
 	if (msm_is_mode_seamless_dyn_clk(msm_mode))
 		return true;
 
+	if (msm_is_mode_seamless_dms(msm_mode))
+		return true;
+
 	return false;
 }