Fix io_uring permission denial for snapuserd

Starting with
https://github.com/torvalds/linux/commit/91a9ab7c942aaa40ac5957eebe71ddae30b2a49c
, calling io_uring_setup will need selinux permission to create anon
inodes.

Test: th
Bug: 244785938

Change-Id: I351983fefabe0f6fdaf9272506ea9dd24bc083a9
diff --git a/private/snapuserd.te b/private/snapuserd.te
index 2e2c473..1be5a5e 100644
--- a/private/snapuserd.te
+++ b/private/snapuserd.te
@@ -53,3 +53,5 @@
   -snapuserd
   -init
 } snapuserd_prop:property_service set;
+
+allow snapuserd self:anon_inode create_file_perms;