qcacmn: Restore NUM_HE_MCS value to 12 for correct rate computation

Since dp_11abgnratetable table supports till 12 mcs for HE modes,
restoring NUM_HE_MCS value to 12 for correct computation of rates

Change-Id: Ieea846cf17866612f94af36de39a4a16f13b9beb

dp/cmn_dp_api/dp_ratetable.h

@@ -40,7 +40,7 @@ enum CMN_BW_TYPES {
 #define NUM_HT_MCS 8
 #define NUM_VHT_MCS 12
 
-#define NUM_HE_MCS 14
+#define NUM_HE_MCS 12
 
 #define NUM_SPATIAL_STREAM 4
 #define NUM_SPATIAL_STREAMS 8