Add Rust bindings

We currently only need these few symbols.

Test: Use them from Rust.
Fixes: 175619259
Change-Id: I0c2ca708c5a6ab550af7103754db775ffbca245b
diff --git a/libcutils/rust/cutils.h b/libcutils/rust/cutils.h
new file mode 100644
index 0000000..9b78af6
--- /dev/null
+++ b/libcutils/rust/cutils.h
@@ -0,0 +1,4 @@
+#pragma once
+
+#include <cutils/multiuser.h>
+#include <private/android_filesystem_config.h>