qcacmn: Add API to get and clear pdev obss stats

Add API to send request to Fw to get and clear pdev obss stats.

Change-Id: I2697cc111eba0310d0a65e9911673670ff476c7f
CRs-Fixed: 3295540

dp/wifi3.0/dp_internal.h

@@ -71,6 +71,9 @@ struct htt_dbgfs_cfg {
 /*Reserve for HTT Stats debugfs support: 5th bit */
 #define DBG_SYSFS_STATS_COOKIE BIT(5)
 
+/* Reserve for HTT Stats OBSS PD support: 6th bit */
+#define DBG_STATS_COOKIE_HTT_OBSS BIT(6)
+
 /**
  * Bitmap of HTT PPDU TLV types for Default mode
  */