drm/xe/hdcp: Fix condition for hdcp gsc cs requirement

Add condition for check of hdcp gsc cs requirement rather than
assuming gsc cs to always be required when xe is loaded. It is not
required for display version < 14

--v2
-Use display version in commit message [Lucas]

Fixes: 152f2df9 ("drm/xe/hdcp: Enable HDCP for XE")
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240308154939.1940960-2-suraj.kandpal@intel.com

drivers/gpu/drm/xe/display/xe_hdcp_gsc.c

@@ -32,7 +32,7 @@ struct intel_hdcp_gsc_message {
 
 bool intel_hdcp_gsc_cs_required(struct xe_device *xe)
 {
-	return true;
+	return DISPLAY_VER(xe) >= 14;
 }
 
 bool intel_hdcp_gsc_check_status(struct xe_device *xe)