Link libwifi-system-iface instead

This commit replaces libwifi-system with libwifi-system-iface because
libwifi-system is a framework-only library.

Bug: 37429084
Test: Sailfish builds, boots, and wifi works.
Change-Id: I2b7c68d60ee84d3dba7500d01323365a699e4ad4
diff --git a/wifi/supplicant/1.0/vts/functional/Android.mk b/wifi/supplicant/1.0/vts/functional/Android.mk
index cfcd4f8..d87d7ef 100644
--- a/wifi/supplicant/1.0/vts/functional/Android.mk
+++ b/wifi/supplicant/1.0/vts/functional/Android.mk
@@ -34,7 +34,8 @@
     liblog \
     libutils \
     libwifi-hal \
-    libwifi-system
+    libwifi-system \
+    libwifi-system-iface
 LOCAL_STATIC_LIBRARIES := \
     libgmock \
     VtsHalHidlTargetTestBase