qcacld-3.0: Add iwpriv pktlog command to clear pktlog buffer

Implement iwpriv pktlog command to clear pktlog buffer.
This command is effective only if pktlog disable is issued previously.
This command needs one argument.
Command to use this feature : iwpriv wlan0 pktlog 4

CRs-Fixed: 2031210
Change-Id: I19d695c30608ab8cde21ee251eee5c5d43d89751
diff --git a/core/hdd/src/wlan_hdd_cfg80211.c b/core/hdd/src/wlan_hdd_cfg80211.c
index 038db8a..d008e4d 100644
--- a/core/hdd/src/wlan_hdd_cfg80211.c
+++ b/core/hdd/src/wlan_hdd_cfg80211.c
@@ -4918,6 +4918,7 @@
 
 	/* size is buff size which can be set using iwpriv command*/
 	start_log.size = 0;
+	start_log.is_pktlog_buff_clear = false;
 
 	cds_set_ring_log_level(start_log.ring_id, start_log.verbose_level);