qcacmn: Add RC index macro for Smart Antenna 320 MHz BW

Add Rate Code Index macro for Smart Antenna 320 MHz BW in per PPDU
stats processing path.

Change-Id: I880cbc5d54f333dc2f8938c1a4d3bd56b96b7a6e
CRs-Fixed: 3429317

dp/wifi3.0/monitor/dp_mon.c

@@ -4168,7 +4168,7 @@ static void dp_process_ppdu_stats_user_cmpltn_common_tlv(
 
 	tag_buf++;
 	/* Extract 320MHz MAX PHY ratecode */
-	ppdu_user_desc->sa_max_rates[bw_iter] =
+	ppdu_user_desc->sa_max_rates[CDP_SA_BW320_INX] =
 		HTT_PPDU_STATS_USER_CMPLTN_COMMON_TLV_MAX_RATES_GET(*tag_buf);
 }