Update supplicant service to use supplicant AIDL V4 interface.

Bug: 348669010
Test: TH Presubmit tests
Test: Manual - Basic Wi-Fi STA connect/disconnect tests.
Change-Id: I14a1a255f168e00fb713abe787ba30510d1e224b
diff --git a/wpa_supplicant/aidl/android.hardware.wifi.supplicant.xml b/wpa_supplicant/aidl/android.hardware.wifi.supplicant.xml
index 37cc3af..103d37f 100644
--- a/wpa_supplicant/aidl/android.hardware.wifi.supplicant.xml
+++ b/wpa_supplicant/aidl/android.hardware.wifi.supplicant.xml
@@ -1,7 +1,7 @@
 <manifest version="1.0" type="device">
 	<hal format="aidl">
 		<name>android.hardware.wifi.supplicant</name>
-		<version>3</version>
+		<version>4</version>
 		<fqname>ISupplicant/default</fqname>
 	</hal>
 </manifest>