Allow vendor_init to do cgroup migration

Bug: 191925901
Test: Build
Signed-off-by: Wei Wang <wvw@google.com>
Change-Id: I68126a1e1ae6193c85f6e0d9baf92a83023f436f
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;