Mark arrays of pointers as const

Previously they were only marked as the pointers pointing to const
data, but the array themselves being non-const.

Change-Id: Ib5a9af6298615b2c40367a21e728899418b09935
diff --git a/common/ih264_common_tables.h b/common/ih264_common_tables.h
index 3127a2c..d4ec147 100644
--- a/common/ih264_common_tables.h
+++ b/common/ih264_common_tables.h
@@ -108,8 +108,8 @@
 extern const UWORD8 gau1_ih264_inv_scan_prog8x8_cabac[64];
 extern const UWORD8 gau1_ih264_inv_scan_int8x8_cabac[64];
 
-extern const UWORD8 *gpau1_ih264_inv_scan8x8[];
-extern const UWORD8 *gpau1_ih264_inv_scan4x4[];
+extern const UWORD8 *const gpau1_ih264_inv_scan8x8[];
+extern const UWORD8 *const gpau1_ih264_inv_scan4x4[];
 
 extern const UWORD8 gau1_ih264_8x8_subblk_idx[];