qcacmn: IWPRIV support for preferred uplink

Add IWPRIV support for preferred uplink. Preferred uplink will
be the interface chosen by the user during creating a fast lane
using two radios.

Change-Id: Id9333f9f083b6a34e7998ca9b02be94c220ed6e8
CRs-fixed: 1069444

dp/inc/cdp_txrx_stats_struct.h

@@ -465,6 +465,7 @@ typedef enum _ol_ath_param_t {
 	OL_ATH_PARAM_FAST_LANE = 340,
 	OL_ATH_PARAM_SECONDARY_OFFSET_IE = 342,
 	OL_ATH_PARAM_WIDE_BAND_SUB_ELEMENT = 343,
+	OL_ATH_PARAM_PREFERRED_UPLINK = 344,
 } ol_ath_param_t;
 
 /*