sdm: Implement Display Config 1_11 Qsync API's.

--Do not set min fps if qsync is active.
--Qsync and active config changes can't be entertained in
  same commit. Reject any such request.

CRs-Fixed: 2529223
Change-Id: Ibd67780aab6d1f0f2e857b7d1fe110a216766baa
diff --git a/libdrmutils/drm_interface.h b/libdrmutils/drm_interface.h
index c22ed6f..eae3512 100644
--- a/libdrmutils/drm_interface.h
+++ b/libdrmutils/drm_interface.h
@@ -779,6 +779,7 @@
 enum struct DRMQsyncMode {
   NONE = 0,
   CONTINUOUS,
+  ONESHOT,
 };
 
 enum struct DRMTopologyControl {