Use "HWUI" LOG_TAG exclusively in libs/hwui/**

"OpenGLRenderer" is no longer accurate, and jreck@ has expressed a
desire to have all logging unified under one tag to allow for filtering,
as logcat is quite noisy.

Bug: N/A
Test: builds and *seems* to pass a quick "#ifndef LOG_TAG" check to
see if LOG_TAG is ever overridden outside of this Android.bp

Change-Id: I8b5413f20a85fb9615bd38778c3262790b7225bf
diff --git a/libs/hwui/Android.bp b/libs/hwui/Android.bp
index b5e6f94..7f80dff 100644
--- a/libs/hwui/Android.bp
+++ b/libs/hwui/Android.bp
@@ -44,7 +44,7 @@
         "-DEGL_EGLEXT_PROTOTYPES",
         "-DGL_GLEXT_PROTOTYPES",
         "-DATRACE_TAG=ATRACE_TAG_VIEW",
-        "-DLOG_TAG=\"OpenGLRenderer\"",
+        "-DLOG_TAG=\"HWUI\"",
         "-Wall",
         "-Wthread-safety",
         "-Wno-unused-parameter",