qcacld-3.0: Disable DBS Scan duty cycle by default

The default value for the ini gdbs_scan_selection is set
with 2 DBS and 2 non-DBS Scan for Module id WLAN_MODULE_
ROAM (5) and WLAN_MODULE_HOST (16). Thus, the scan policy
for full scan is kept getting change for DBS scan and
legacy scan.

This change is to make the default value for the ini
gdbs_scan_selection as NULL, thus disabling the DBS scan
duty cycle feature by default.

Change-Id: I8dd304628b729e11a63aaa2b6dea972cff1798d7
CRs-Fixed: 2062420

core/hdd/inc/wlan_hdd_cfg.h

@@ -8430,9 +8430,11 @@ enum dot11p_mode {
 /*
  * <ini>
  * gdbs_scan_selection - DBS Scan Selection.
- * @Default: 5,2,2,16,2,2
+ * @Default: ""
  *
  * This ini is used to enable DBS scan selection.
+ * Example
+ * @Value: "5,2,2,16,2,2"
  * 1st argument is module_id, 2nd argument is number of DBS scan,
  * 3rd argument is number of non-DBS scan,
  * and other arguments follows.
@@ -8449,7 +8451,7 @@ enum dot11p_mode {
  * </ini>
  */
 #define CFG_DBS_SCAN_SELECTION_NAME          "gdbs_scan_selection"
-#define CFG_DBS_SCAN_SELECTION_DEFAULT       "5,2,2,16,2,2"
+#define CFG_DBS_SCAN_SELECTION_DEFAULT       ""
 
 /*
  * gPNOChannelPrediction will allow user to enable/disable the