Add getModuleMetadataPackageName API to PackageManagerNative binder

It will be used by dumpstate to log mainline version in the bugreport.
For more context see attached bug.

Test: builds
Bug: 131774400
Change-Id: Ie4e612d0ed29509e51ec4352c75d4f565bbf2575
diff --git a/libs/binder/aidl/android/content/pm/IPackageManagerNative.aidl b/libs/binder/aidl/android/content/pm/IPackageManagerNative.aidl
index 90980b8..a7a7292 100644
--- a/libs/binder/aidl/android/content/pm/IPackageManagerNative.aidl
+++ b/libs/binder/aidl/android/content/pm/IPackageManagerNative.aidl
@@ -81,4 +81,10 @@
      * returned Status before using the result of this function.
      */
     int getTargetSdkVersionForPackage(in String packageName);
+
+    /**
+     * Returns the name of module metadata package, or empty string if device doesn't have such
+     * package.
+     */
+    @utf8InCpp String getModuleMetadataPackageName();
 }