Cleanup: move VINTF fragment into VAPEX

Bug: 296524155
Test: m && launch_cvd
    # usb hal service is running
Change-Id: I5aebf03e1f651b8cd2753627ad55022be9eba8d6
diff --git a/usb/aidl/default/Android.bp b/usb/aidl/default/Android.bp
index 472e732..2c6ed07 100644
--- a/usb/aidl/default/Android.bp
+++ b/usb/aidl/default/Android.bp
@@ -43,9 +43,11 @@
     ],
 }
 
-filegroup {
+prebuilt_etc {
     name: "android.hardware.usb-service.example.xml",
-    srcs: ["android.hardware.usb-service.example.xml"],
+    src: "android.hardware.usb-service.example.xml",
+    sub_dir: "vintf",
+    installable: false,
 }
 
 filegroup {