ANDROID: rust: security: add helpers for security_binder_*

There is currently a build failure if you build with CONFIG_SECURITY=n.
This is because the LSM helpers for these methods are marked inline when
you disable CONFIG_SECURITY=n, so they can't be called from Rust. Add
helpers to handle this case.

Fixes: d5fd4e90e7 ("ANDROID: rust: add security::binder_* methods")
Change-Id: Ia3b8c1f004c00d01fcf707ea7b4adfeba322d945
Signed-off-by: Alice Ryhl <aliceryhl@google.com>

rust/helpers/security.c

@@ -17,4 +17,28 @@ void rust_helper_security_release_secctx(char *secdata, u32 seclen)
 {
 	security_release_secctx(secdata, seclen);
 }
+
+int rust_helper_security_binder_set_context_mgr(const struct cred *mgr)
+{
+	return security_binder_set_context_mgr(mgr);
+}
+
+int rust_helper_security_binder_transaction(const struct cred *from,
+					    const struct cred *to)
+{
+	return security_binder_transaction(from, to);
+}
+
+int rust_helper_security_binder_transfer_binder(const struct cred *from,
+						const struct cred *to)
+{
+	return security_binder_transfer_binder(from, to);
+}
+
+int rust_helper_security_binder_transfer_file(const struct cred *from,
+					      const struct cred *to,
+					      const struct file *file)
+{
+	return security_binder_transfer_file(from, to, file);
+}
 #endif