qcacmn: Add scan macros related to scan start-offset parameter

These macros define the min & max time from TBTT, when the scan
dwell time starts. They can be used as a parameter to the scan
WMI command.

CRs-Fixed: 3154082
Change-Id: Ieca8acfd2e6897a8e45fafaaffd8f283f451d203

umac/scan/dispatcher/inc/wlan_scan_public_structs.h

@@ -125,6 +125,10 @@ typedef uint32_t wlan_scan_id;
  */
 #define LOW_SPAN_PASSIVE_DWELL_TIME 110
 
+/* Min & Max offset from TBTT, after which Scan can start */
+#define SCAN_START_OFFSET_MIN 26 /* msec */
+#define SCAN_START_OFFSET_MAX 90 /* msec */
+
 /* forward declaration */
 struct wlan_objmgr_vdev;
 struct wlan_objmgr_pdev;