drm_hwcomposer: Make gl worker log tag consistent with rest of hwc

For easy logcat grepping.

Change-Id: I79b82f4d359268a6e116f602f2ffb90885cdb3dd
Signed-off-by: Sean Paul <seanpaul@chromium.org>
diff --git a/glworker.cpp b/glworker.cpp
index 4556430..f18ace9 100644
--- a/glworker.cpp
+++ b/glworker.cpp
@@ -15,7 +15,7 @@
  */
 
 #define ATRACE_TAG ATRACE_TAG_GRAPHICS
-#define LOG_TAG "GLWorker"
+#define LOG_TAG "hwc-gl-worker"
 
 #include <algorithm>
 #include <string>