sdm: Add a property to disable scalar

- Add 'sdm.debug.disable_scalar' property to disable scalar.

Change-Id: Iee0128cc06f1d78ddec011d34086c2c1d7ba3059

sdm/include/utils/debug.h

@@ -70,6 +70,7 @@ class Debug {
   static bool IsVideoModeEnabled();
   static bool IsRotatorUbwcDisabled();
   static bool IsRotatorSplitDisabled();
+  static bool IsScalarDisabled();
 
  private:
   Debug();

sdm/libs/utils/debug.cpp

@@ -120,5 +120,12 @@ bool Debug::IsRotatorSplitDisabled() {
   return (value == 1);
 }
 
+bool Debug::IsScalarDisabled() {
+  int value = 0;
+  debug_.debug_handler_->GetProperty("sdm.debug.disable_scalar", &value);
+
+  return (value == 1);
+}
+
 }  // namespace sdm