qcacld-3.0: Change default value of idle_roam_rssi_delta to 3

idle_roam_rssi_delta - This threshold is the criteria to decide whether
DUT is idle or moving. If rssi delta is more than configured thresold
then its considered as not idle. RSSI delta is entered in dBm. Idle
roaming can be triggered if the connected AP rssi change exceeds or
falls below the rssi delta and if other criteria of ini
"enable_idle_roam" is met.

To enhance idle roaming, idle_roam_rssi_delta default value is changed
to 3.

Change-Id: I9a5b06081d59d8502c40df0485c2b997cbcb2b80
CRs-Fixed: 2619436

components/mlme/dispatcher/inc/cfg_mlme_lfr.h

@@ -2212,7 +2212,7 @@
  * rssi delta and if other criteria of ini "enable_idle_roam" is met
  * @Min: 0
  * @Max: 50
- * @Default: 5
+ * @Default: 3
  *
  * Related: enable_idle_roam
  *
@@ -2226,7 +2226,7 @@
 	"idle_roam_rssi_delta", \
 	0, \
 	50, \
-	5, \
+	3, \
 	CFG_VALUE_OR_DEFAULT, \
 	"Configure RSSI delta to start idle roam")