sdm: hwc: Add support for GetVisibleDisplayRect

Support the binder API to get the display visible rectangle
which is the union of all the app layer's displayframe.

Change-Id: I05d750c80dda5b735bac5938410ddeeeb8823dd1
diff --git a/sdm/libs/hwc/cpuhint.cpp b/sdm/libs/hwc/cpuhint.cpp
index f328268..ccf55bf 100644
--- a/sdm/libs/hwc/cpuhint.cpp
+++ b/sdm/libs/hwc/cpuhint.cpp
@@ -29,6 +29,7 @@
 
 #include <cutils/properties.h>
 #include <dlfcn.h>
+#include <utils/debug.h>
 
 #include "cpuhint.h"
 #include "hwc_debugger.h"