Adding require_root for libfs_avb_device_test

The test requires to load and verify vbmeta struct from partitions,
and thus needs adb root.

Bug: None
Test: atest libfs_avb_device_test
Change-Id: I4924d6e41edc78898d9ef9c3d7f52c9066f750b1
diff --git a/fs_mgr/libfs_avb/Android.bp b/fs_mgr/libfs_avb/Android.bp
index 414a186..32702ae 100644
--- a/fs_mgr/libfs_avb/Android.bp
+++ b/fs_mgr/libfs_avb/Android.bp
@@ -123,6 +123,7 @@
 cc_test {
     name: "libfs_avb_device_test",
     test_suites: ["device-tests"],
+    require_root: true,
     static_libs: [
         "libavb",
         "libdm",