display: Enable more Debug logs.

   - Dump more info for BUFFER_SYNC ioctl failure case.
   - Enable debug logs for blank/unblank display.

Change-Id: I289ed8ad39a0181ff4a404644b90cb02a8144b9a
diff --git a/libhwcomposer/hwc.cpp b/libhwcomposer/hwc.cpp
index 3bf1504..9bf0c45 100644
--- a/libhwcomposer/hwc.cpp
+++ b/libhwcomposer/hwc.cpp
@@ -41,7 +41,7 @@
 using namespace overlay;
 
 #define VSYNC_DEBUG 0
-#define BLANK_DEBUG 0
+#define BLANK_DEBUG 1
 
 static int hwc_device_open(const struct hw_module_t* module,
                            const char* name,