libsnapshot_test runs as root

Add flag in Android.bp to force the execution of libsnapshot_test as
root.

Test: m
Bug: 142513589
Change-Id: I9d047a9e1f9ea6d6e5540fa66fb42603ea136641
Signed-off-by: Alessio Balsini <balsini@google.com>
diff --git a/fs_mgr/libsnapshot/Android.bp b/fs_mgr/libsnapshot/Android.bp
index c67e33d..447265a 100644
--- a/fs_mgr/libsnapshot/Android.bp
+++ b/fs_mgr/libsnapshot/Android.bp
@@ -182,6 +182,7 @@
     header_libs: [
         "libstorage_literals_headers",
     ],
+    require_root: true,
 }
 
 cc_binary {