hwc: Enable mdp downscale feature for 4k resolution

Enable MDP Downscale feature for primary resolution greater than
2048 only for the targets that supports source split.

Change-Id: I21871b099f74543aa8c2416bac41e3a16d4ce72d
diff --git a/libhwcomposer/hwc_utils.h b/libhwcomposer/hwc_utils.h
index 98e53a6..845897c 100644
--- a/libhwcomposer/hwc_utils.h
+++ b/libhwcomposer/hwc_utils.h
@@ -21,7 +21,9 @@
 #ifndef HWC_UTILS_H
 #define HWC_UTILS_H
 
+#define DEBUG_MDPDOWNSCALE 0
 #define HWC_REMOVE_DEPRECATED_VERSIONS 1
+
 #include <fcntl.h>
 #include <math.h>
 #include <hardware/hwcomposer.h>