qcacmn: Race condition while using pkt log buffer

There can be a race condition if the pktlog_buf inside pktlog APIs,
is accessed simultanously from two threads.
To prevent this use mutex in the caller functions of pktlog APIs.

Change-Id: Iea6e3cd28a7a347c1753fe71d0646fb43ee184fa
CRs-Fixed: 2047150

utils/pktlog/include/pktlog_ac_api.h

@@ -98,6 +98,7 @@ struct ath_pktlog_info {
 	/* Size of buffer in bytes */
 	int32_t buf_size;
 	spinlock_t log_lock;
+	struct mutex pktlog_mutex;
 
 	/* Threshold of TCP SACK packets for triggered stop */
 	int sack_thr;