hwc: Clean up scattered definitions of commonly used constants/values

Clean up scattered definitions of commonly used constants/values.
There is no need in re-defining these in several places.

Change-Id: I22c082b56646cb02d5ae4733d110afc81aaff50a
diff --git a/liboverlay/overlay.cpp b/liboverlay/overlay.cpp
index de880c6..46b6275 100644
--- a/liboverlay/overlay.cpp
+++ b/liboverlay/overlay.cpp
@@ -32,6 +32,7 @@
 #include "pipes/overlayGenPipe.h"
 #include "mdp_version.h"
 #include "qdMetaData.h"
+#include "qd_utils.h"
 
 #define PIPE_DEBUG 0
 
@@ -430,7 +431,6 @@
     }
 
     FILE *displayDeviceFP = NULL;
-    const int MAX_FRAME_BUFFER_NAME_SIZE = 128;
     char fbType[MAX_FRAME_BUFFER_NAME_SIZE];
     char msmFbTypePath[MAX_FRAME_BUFFER_NAME_SIZE];
     const char *strDtvPanel = "dtv panel";