qcacmn: Modify default value of last_scan_ageout_time

Currently, default value of last_scan_ageout_time ini is 0 sec.
Modify it to 30 sec to avoid dependency on userspace
configuration.

Change-Id: If0d00c98950a0c20f22ee73d01e4442bd0d677c0
CRs-Fixed: 3625696

umac/scan/dispatcher/inc/cfg_scan.h

@@ -1482,7 +1482,7 @@ enum scan_mode_6ghz {
 			"last_scan_ageout_time", \
 			0, \
 			30000, \
-			0, \
+			30000, \
 			CFG_VALUE_OR_DEFAULT, \
 			"last scan ageout time")
 #define CFG_SCAN_ALL \