qdMetadata: Use uint32_t instead of bool

Some graphics drivers don't recognize bool (^^) so use uint32_t
instead to fix compilation issues.

Change-Id: I12e13ed4d13ec241467a4c5a2b9cf2e409ee5505
diff --git a/libqdutils/qdMetaData.h b/libqdutils/qdMetaData.h
index a927f75..a1d9350 100644
--- a/libqdutils/qdMetaData.h
+++ b/libqdutils/qdMetaData.h
@@ -78,7 +78,7 @@
     uint32_t linearFormat;
     /* Set by graphics to indicate that this buffer will be written to but not
      * swapped out */
-    bool isSingleBufferMode;
+    uint32_t isSingleBufferMode;
 };
 
 enum DispParamType {