sandbox: add sandbox sm uclass driver

This patch adds sandbox secure monitor driver.

Signed-off-by: Alexey Romanov <avromanov@salutedevices.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Link: https://lore.kernel.org/r/20230921081346.22157-3-avromanov@salutedevices.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>

include/sandbox-sm.h

@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2023 SberDevices, Inc.
+ *
+ * Author: Alexey Romanov <avromanov@salutedevices.com>
+ */
+
+#ifndef __SANDBOX_SM_H__
+#define __SANDBOX_SM_H__
+
+enum sandbox_smc_cmd {
+	SANDBOX_SMC_CMD_READ_MEM,
+	SANDBOX_SMC_CMD_WRITE_MEM,
+	SANDBOX_SMC_CMD_COMMON,
+	SANDBOX_SMC_CMD_COUNT,
+};
+
+#endif