qcacld-3.0: Add support to get per chain rssi stats

Propagation from qcacld-2.0 to qcalcd-3.0.

Add support to get per chain rssi from fw via
already existing WMI command WMI_REQUEST_STATS_CMDID
and then store it in the station_info structure defined
by cfg80211.

Change-Id: Id50c96dd322b5ca4db34cf2df901730d8b103251
CRs-Fixed: 1005367
diff --git a/core/sme/inc/sme_api.h b/core/sme/inc/sme_api.h
index db91ca7..2514084 100644
--- a/core/sme/inc/sme_api.h
+++ b/core/sme/inc/sme_api.h
@@ -60,6 +60,7 @@
 #define SME_GLOBAL_CLASSC_STATS   8
 #define SME_GLOBAL_CLASSD_STATS  16
 #define SME_PER_STA_STATS        32
+#define SME_PER_CHAIN_RSSI_STATS 64
 
 #define SME_SESSION_ID_ANY        50