sdm: Parse UBWC feature from MDP caps

1. Parse "ubwc" string in MDP caps feature list.
2. Add support to read system prop "sdm.debug.rotator_disable_ubwc".

Change-Id: Ie43b81237960e6c1e8784801b10cd39df069cddc
diff --git a/sdm/libs/utils/debug.cpp b/sdm/libs/utils/debug.cpp
index 8676546..ada17cd 100644
--- a/sdm/libs/utils/debug.cpp
+++ b/sdm/libs/utils/debug.cpp
@@ -106,5 +106,12 @@
   return (value == 1);
 }
 
+bool Debug::IsRotatorUbwcDisabled() {
+  int value = 0;
+  debug_.debug_handler_->GetProperty("sdm.debug.rotator_disable_ubwc", &value);
+
+  return (value == 1);
+}
+
 }  // namespace sdm