kona: Add support to allow Dual STA combination

This adds a new flag QC_WIFI_HIDL_FEATURE_DUAL_STA to allow dual
station funtionality from wifi framework.

Change-Id: Ifa98223d8aa09636194fb5f10b8796e44aad5f32
CRs-Fixed: 2579399

kona/wlan.mk

@@ -24,3 +24,6 @@ WIFI_HIDL_FEATURE_DUAL_INTERFACE := true
 
 # Enable SAP + SAP Feature.
 QC_WIFI_HIDL_FEATURE_DUAL_AP := true
+
+# Enable STA + STA Feature.
+QC_WIFI_HIDL_FEATURE_DUAL_STA := true