qcacmn: Adjust the bin5 rssi threshold in radar filters

Radar bandwidth detection at certain frquencies is reported to
be lower than the acceptable threshold.  This is due to the low
rssi reported in the phyerrors.

Fix the issue by adjusting the rssi threshold accordingly.

Change-Id: Id00e6ae4722d1f4c820037a4014a86953abc6650
CRs-Fixed: 2224053

umac/dfs/core/src/filtering/dfs_partial_offload_radar.c

@@ -97,7 +97,7 @@ static struct dfs_pulse dfs_mkk4_radars[] = {
  *                                           chipsets.
  */
 static struct dfs_bin5pulse dfs_fcc_bin5pulses[] = {
-	{5, 28, 105, 12, 22, 5},
+	{6, 28, 105, 12, 18, 5},
 };
 
 /**