sdm: Add split rectangle support for split rotation.

1. Add support to split rectangle vertically and horizontally.
2. Add debug property to enable/disable split rotation.

Change-Id: I4070e7e754c2a3a3a9ca4f4eab91037f7f9c88b7
diff --git a/sdm/include/utils/debug.h b/sdm/include/utils/debug.h
index 0bd0429..0d64bbf 100644
--- a/sdm/include/utils/debug.h
+++ b/sdm/include/utils/debug.h
@@ -69,6 +69,7 @@
   static int GetMaxPipesPerMixer(DisplayType display_type);
   static bool IsVideoModeEnabled();
   static bool IsRotatorUbwcDisabled();
+  static bool IsRotatorSplitDisabled();
 
  private:
   Debug();