Allow adaptive scan to support a reduced txfm kernel set

Reduce the supported txfm kernel set from 9 to 4. This
substantially reduce the memory requirement in SRAM for hw design.

Change-Id: Id4f75b7fb1eaad05efe6db89a7bfc60d0324bd35

av1/common/scan.h

@@ -30,8 +30,9 @@ extern const SCAN_ORDER av1_intra_scan_orders[TX_SIZES_ALL][TX_TYPES];
 extern const SCAN_ORDER av1_inter_scan_orders[TX_SIZES_ALL][TX_TYPES];
 
 #if CONFIG_ADAPT_SCAN
-#define USE_2X2_PROB 1
-#define CACHE_SCAN_PROB 1
+#define USE_2X2_PROB 0
+#define CACHE_SCAN_PROB 0
+#define REDUCED_SET 1
 #define USE_TOPOLOGICAL_SORT 0
 #define USE_LIMIT_SCAN_DISTANCE 0
 void av1_update_scan_count_facade(AV1_COMMON *cm, FRAME_COUNTS *counts,
@@ -91,6 +92,11 @@ static INLINE int do_adapt_scan(TX_SIZE tx_size, TX_TYPE tx_type) {
   (void)tx_size;
   if (tx_size_2d[tx_size] >= 1024 && tx_type != DCT_DCT) return 0;
   if (tx_size > TX_32X16) return 0;
+#if CONFIG_ADAPT_SCAN
+#if REDUCED_SET
+  return tx_type <= ADST_ADST;
+#endif
+#endif
   return tx_type < IDTX;
 }