aom_qm_ext: add signaling for separate QM for U/V

Change-Id: I9879264011f6450bd2eb6648e39e9ad47f13a7d8
diff --git a/av1/common/quant_common.h b/av1/common/quant_common.h
index e3b4f84..0f2fc6e 100644
--- a/av1/common/quant_common.h
+++ b/av1/common/quant_common.h
@@ -31,6 +31,11 @@
 #define NUM_QM_LEVELS (1 << QM_LEVEL_BITS)
 /* Range of QMS is between first and last value, with offset applied to inter
  * blocks*/
+#if CONFIG_AOM_QM_EXT
+#define DEFAULT_QM_Y 10
+#define DEFAULT_QM_U 11
+#define DEFAULT_QM_V 12
+#endif  // CONFIG_AOM_QM_EXT
 #define DEFAULT_QM_FIRST 5
 #define DEFAULT_QM_LAST 9
 #endif