binder: Implement iface methods

Implement the following iface methods:
1. Reassociate
2. Reconnect
3. Disconnct

BUG: 30093041
Change-Id: I83a527a06c89f05e693212c536f21494c678843e
TEST: Writing new tests in |wpa_supplicant_binder_test|
Signed-off-by: Roshan Pius <rpius@google.com>
diff --git a/wpa_supplicant/binder/iface.h b/wpa_supplicant/binder/iface.h
index 50d7d80..5a727f0 100644
--- a/wpa_supplicant/binder/iface.h
+++ b/wpa_supplicant/binder/iface.h
@@ -47,6 +47,9 @@
 	android::binder::Status RegisterCallback(
 	    const android::sp<fi::w1::wpa_supplicant::IIfaceCallback> &callback)
 	    override;
+	android::binder::Status Reassociate() override;
+	android::binder::Status Reconnect() override;
+	android::binder::Status Disconnect() override;
 
 private:
 	struct wpa_supplicant *retrieveIfacePtr();