disp: msm: sde: expose cdm block count through connector

Expose the number of cdm blocks available through the connector
capabilities. Add CDM to the topology_control table, so usermode
can use the property to reserve the CDM block during modeset.
Additionally, fix a error code return during CDM block reservation
failure in sde resource manager.

Change-Id: Ib42ca4e8614076a8e5df77d8abc77a9e73674390
Signed-off-by: Veera Sundaram Sankaran <quic_veeras@quicinc.com>

msm/sde/sde_connector.c

@@ -57,6 +57,7 @@ static const struct drm_prop_enum_list e_topology_control[] = {
 	{SDE_RM_TOPCTL_DSPP,		"dspp"},
 	{SDE_RM_TOPCTL_DS,		"ds"},
 	{SDE_RM_TOPCTL_DNSC_BLUR,	"dnsc_blur"},
+	{SDE_RM_TOPCTL_CDM,		"cdm"},
 };
 static const struct drm_prop_enum_list e_power_mode[] = {
 	{SDE_MODE_DPMS_ON,	"ON"},