ext-partition-types: Add 64x16 and 16x64 bsizes

Change-Id: I0c3772110e9fa62ac687bd99e290b5006bf3bd6c
diff --git a/av1/encoder/rd.c b/av1/encoder/rd.c
index fdb0bfe..963984c 100644
--- a/av1/encoder/rd.c
+++ b/av1/encoder/rd.c
@@ -54,11 +54,11 @@
 #if CONFIG_CHROMA_2X2 || CONFIG_CHROMA_SUB8X8
   2,  2,  2,
 #endif
-  2,  3,  3,  4, 6, 6, 8, 12, 12, 16, 24, 24, 32,
+  2,  3,  3,  4, 6,  6, 8, 12, 12, 16, 24, 24, 32,
 #if CONFIG_EXT_PARTITION
   48, 48, 64,
 #endif  // CONFIG_EXT_PARTITION
-  4,  4,  8,  8
+  4,  4,  8,  8, 16, 16
 };
 
 void av1_fill_mode_rates(AV1_COMMON *const cm, MACROBLOCK *x,