Add package name for build flag

Bug: 303466154
Change-Id: Ia48e9ca2da6d0d17179998200e0ebdb238a4d217

libwvdrmengine/apex/prebuilt/Android.bp

@@ -46,4 +46,12 @@ apex_set {
         config_namespace: "widevine",
         var_name: "source_build",
     },
+}
+
+apex_set {
+    name: "com.google.android.widevine-wv_341113000",
+    apex_name: "com.google.android.widevine",
+    owner: "google",
+    set: "com.google.android.widevine.nonupdatable-wv_341113000.apks",
+    vendor: true,
 }