Allow vendor_init to do cgroup migration am: c954e7c50b

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/google/pixel-sepolicy/+/15105325

Change-Id: I769efade03d6d021bc8e660b9840ae97e84d5ffd
diff --git a/common/vendor_init.te b/common/vendor_init.te
new file mode 100644
index 0000000..7299a26
--- /dev/null
+++ b/common/vendor_init.te
@@ -0,0 +1,2 @@
+# for cgroup migration
+allow vendor_init cgroup:file rw_file_perms;