plat: marvell: Add support for Armada-37xx SoC platform

Add supprot for Marvell platforms based on Armada-37xx SoC.
This includes support for the official Armada-3720 modular
development board and EspressoBin community board.
The Armada-37xx SoC contains dual Cortex-A53 Application CPU,
single secure CPU (Cortex-M3) and the following interfaces:
- SATA 3.0
- USB 3.0 and USB 2.0
- PCIe
- SDIO (supports boot from eMMC)
- SPI
- UART
- I2c
- Gigabit Ethernet

Signed-off-by: Konstantin Porotchkin <kostap@marvell.com>
diff --git a/include/plat/marvell/a3700/common/armada_common.h b/include/plat/marvell/a3700/common/armada_common.h
new file mode 100644
index 0000000..9fc4634
--- /dev/null
+++ b/include/plat/marvell/a3700/common/armada_common.h
@@ -0,0 +1,16 @@
+/*
+ * Copyright (C) 2018 Marvell International Ltd.
+ *
+ * SPDX-License-Identifier:     BSD-3-Clause
+ * https://spdx.org/licenses
+ */
+
+#ifndef __ARMADA_COMMON_H__
+#define __ARMADA_COMMON_H__
+
+#include <io_addr_dec.h>
+#include <stdint.h>
+
+int marvell_get_io_dec_win_conf(struct dec_win_config **win, uint32_t *size);
+
+#endif /* __ARMADA_COMMON_H__ */