wpa_supplicant: Rename |Iface| & |INetwork|

Modify the implementation to reflect the change in the HIDL interface.
Each Iface/Network object now has 2 types based on whether it represents
a P2P or STA iface.
Rename the current Iface & Network classes to StaIface & StaNetwork.

Bug: 32553421
Test: Compiles
Change-Id: Iaa55ddf5e74f4e2d3c8d367917e00a52669c74d6
diff --git a/wpa_supplicant/Android.mk b/wpa_supplicant/Android.mk
index 5a3cd29..019bf9f 100644
--- a/wpa_supplicant/Android.mk
+++ b/wpa_supplicant/Android.mk
@@ -1669,8 +1669,8 @@
 LOCAL_SRC_FILES := \
     hidl/hidl.cpp \
     hidl/hidl_manager.cpp \
-    hidl/iface.cpp \
-    hidl/network.cpp \
+    hidl/sta_iface.cpp \
+    hidl/sta_network.cpp \
     hidl/supplicant.cpp
 LOCAL_SHARED_LIBRARIES := \
     android.hardware.wifi.supplicant@1.0 \