sdm: Do not allow decimation on UBWC framebuffer

MDP hardware cannot apply decimation on UBWC tiled framebuffer.

CRs-Fixed: 867832

Change-Id: I6f2f37955ac9e2b4a6d7888c146930dd3863f385
diff --git a/sdm/include/utils/debug.h b/sdm/include/utils/debug.h
index 943747b..95efef6 100644
--- a/sdm/include/utils/debug.h
+++ b/sdm/include/utils/debug.h
@@ -70,6 +70,7 @@
   static bool IsRotatorUbwcDisabled();
   static bool IsRotatorSplitDisabled();
   static bool IsScalarDisabled();
+  static bool IsUbwcTiledFrameBuffer();
 
  private:
   Debug();