Define vintf fragment as a module

Define vintf fragment as a module, so it can be used from multiple
soong-defined modules.

Bug: 322089980
Test: aosp_cf_x86_64_phone build succeeded
(cherry picked from https://android-review.googlesource.com/q/commit:8c1af351129febcebea9ddc5f8e584a6a6a3bd97)
Change-Id: I817efd443e49439e4134fca8bd3fd034bbbcc3cc
diff --git a/wpa_supplicant/Android.mk b/wpa_supplicant/Android.mk
index 98152be..eb4224b 100644
--- a/wpa_supplicant/Android.mk
+++ b/wpa_supplicant/Android.mk
@@ -1973,7 +1973,7 @@
 LOCAL_SHARED_LIBRARIES += libutils libbase
 LOCAL_SHARED_LIBRARIES += libbinder_ndk
 LOCAL_STATIC_LIBRARIES += libwpa_aidl
-LOCAL_VINTF_FRAGMENTS := aidl/android.hardware.wifi.supplicant.xml
+LOCAL_REQUIRED_MODULES += android.hardware.wifi.supplicant.xml
 ifeq ($(WIFI_HIDL_UNIFIED_SUPPLICANT_SERVICE_RC_ENTRY), true)
 LOCAL_INIT_RC=aidl/android.hardware.wifi.supplicant-service.rc
 endif