qcacld-3.0: Update proper NSS in OMN ie of assoc request

Host adds OMN ie in the association request only if the AP to
which DUT associates advertises OMN IE and DUT supports VHT.

Update proper NSS in OMN ie of assoc request to overcome low
throughput issues in VHT op mode.

Change-Id: If00042b5f61016efb7839b87d7e8a46513f6d520
CRs-Fixed: 2660821

core/mac/src/pe/lim/lim_prop_exts_utils.c

@@ -494,6 +494,7 @@ void lim_extract_ap_capability(struct mac_context *mac_ctx, uint8_t *p_ie,
 			else
 				session->gLimOperatingMode.chanWidth =
 					CH_WIDTH_160MHZ;
+			session->gLimOperatingMode.rxNSS = session->nss - 1;
 		} else {
 			pe_err("AP does not support op_mode rx");
 		}