drivers: marvell: mg_conf_cm3: add basic driver

Implement function which will allow to start AP FW.

Change-Id: Ie0fc8ad138bf56b10809cdc92d1e5e96a2aaf33f
Signed-off-by: Grzegorz Jaszczyk <jaz@semihalf.com>
diff --git a/drivers/marvell/mg_conf_cm3/mg_conf_cm3.h b/drivers/marvell/mg_conf_cm3/mg_conf_cm3.h
new file mode 100644
index 0000000..44c7b69
--- /dev/null
+++ b/drivers/marvell/mg_conf_cm3/mg_conf_cm3.h
@@ -0,0 +1,8 @@
+/*
+ * Copyright (C) 2019 Marvell International Ltd.
+ *
+ * SPDX-License-Identifier:     BSD-3-Clause
+ * https://spdx.org/licenses
+ */
+
+void mg_start_ap_fw(int cp_nr);