wlan: Changes to discard candidates with low RSSI

Candidate with very low RSSI shouldn't be considered as roam
candidate.

Add changes to discard candidates if RSSI is very low.

CRs-Fixed: 1067368
Change-Id: If92ed616d093c38da068fb17f13ceaef9a4bd1fe
diff --git a/CORE/SME/src/csr/csrInsideApi.h b/CORE/SME/src/csr/csrInsideApi.h
index f9a38bf..f61c923 100644
--- a/CORE/SME/src/csr/csrInsideApi.h
+++ b/CORE/SME/src/csr/csrInsideApi.h
@@ -138,6 +138,7 @@
 #define PER_EXCELENT_RSSI -40
 #define PER_GOOD_RSSI -55
 #define PER_POOR_RSSI -65
+#define PER_BAD_RSSI  -80
 #define PER_ROAM_EXCELLENT_RSSI_WEIGHT 100
 #define PER_ROAM_GOOD_RSSI_WEIGHT 80
 #define PER_ROAM_BAD_RSSI_WEIGHT 60