qcacmn: Add accumulated last_tx_rate in cdp_tx_stats

Add accumulated last_tx_rate stat in cdp_tx_stats

Change-Id: I3d939b0f058e838e426c5fd77d576deb008288b6

dp/inc/cdp_txrx_stats_struct.h

@@ -307,6 +307,7 @@ struct cdp_tx_stats {
 	uint32_t failed_retry_count;
 	uint32_t retry_count;
 	uint32_t multiple_retry_count;
+	uint32_t last_tx_rate_used;
 };
 
 /* struct cdp_rx_stats - rx Level Stats