qcacld-3.0: Update gNeighborLookupThreshold INI comment

After the change in commit I75f0b76ae920c885a1150d95ea011e5612ef62fd,
the gNeighborLookupThreshold INI value will be a negative number. This
update ensures that the INI comment accurately reflects the change.

Additionally, existing INI files may still include a positive number
(e.g., 76). To maintain compatibility, the default value is updated to
-76 in case the INI files haven't been updated to use negative numbers.

Change-Id: I1c588fcbc5716d9efadf1272842d60a29c26eba6
CRs-Fixed: 3826341

components/mlme/dispatcher/inc/cfg_mlme_lfr.h

@@ -92,7 +92,7 @@
 # define RoamScan_AwayTime_default 0
 # define RoamRSSI_Trigger_min -100
 # define RoamRSSI_Trigger_max -50
-# define RoamRSSI_Trigger_default -78
+# define RoamRSSI_Trigger_default -76
 # define RoamCU_Trigger_min 0
 # define RoamCU_Trigger_max 100
 # define RoamCU_Trigger_default 70
@@ -1560,9 +1560,9 @@
  * <ini>
  * gNeighborLookupThreshold/RoamRSSI_Trigger - Set neighbor lookup rssi
  * threshold
- * @Min: 50
- * @Max: 100
- * @Default: 78
+ * @Min: -100
+ * @Max: -50
+ * @Default: -76
  *
  * This is used to control the RSSI threshold for neighbor lookup.
  *