sdm: drm: Defer first null commit

Defer first null commit to the first actual draw cycle. This reduces
the duration of blank screen between splash and boot animation.

Change-Id: I192465ba213e19d1abae1128ddbe5ccfab20b217
CRs-fixed: 2106859
diff --git a/libdrmutils/drm_interface.h b/libdrmutils/drm_interface.h
index 5051bed..c870597 100644
--- a/libdrmutils/drm_interface.h
+++ b/libdrmutils/drm_interface.h
@@ -292,6 +292,12 @@
    *      uint32_t - FB Secure mode
    */
   CONNECTOR_SET_FB_SECURE_MODE,
+  /*
+   * Op: Sets a crtc id to this connector
+   * Arg: uint32_t - Connector ID
+   *      uint32_t - CRTC ID
+   */
+  CONNECTOR_SET_CRTC,
 };
 
 enum struct DRMRotation {