Avoid the use of undefined marco value

Always define USE_TXTYPE_SEARCH_FOR_SUB8X8_IN_CB4X4 to avoid the
use of undefined value.

Change-Id: I0ad90c5b5316db231e9538487bb4591dfd6a9ce7
diff --git a/av1/common/blockd.h b/av1/common/blockd.h
index 6192291..745c85a 100644
--- a/av1/common/blockd.h
+++ b/av1/common/blockd.h
@@ -595,8 +595,9 @@
 }
 #endif  // CONFIG_SUPERTX
 
-#if CONFIG_EXT_TX
+#define USE_TXTYPE_SEARCH_FOR_SUB8X8_IN_CB4X4 1
 
+#if CONFIG_EXT_TX
 #define ALLOW_INTRA_EXT_TX 1
 
 typedef enum {
@@ -638,7 +639,6 @@
   0, 3, -1, -1, 2, 1
 };
 
-#define USE_TXTYPE_SEARCH_FOR_SUB8X8_IN_CB4X4 1
 static INLINE TxSetType get_ext_tx_set_type(TX_SIZE tx_size, BLOCK_SIZE bs,
                                             int is_inter, int use_reduced_set) {
   const TX_SIZE tx_size2 = txsize_sqr_up_map[tx_size];