riscv: Add Microchip MPFS Icicle board support

This patch adds Microchip MPFS Icicle board support.
For now, NS16550 serial driver is only enabled.
The Microchip MPFS Icicle defconfig by default builds
U-Boot for M-Mode with SMP support.

Signed-off-by: Padmarao Begari <padmarao.begari@microchip.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
diff --git a/board/microchip/mpfs_icicle/Makefile b/board/microchip/mpfs_icicle/Makefile
new file mode 100644
index 0000000..72b0410
--- /dev/null
+++ b/board/microchip/mpfs_icicle/Makefile
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright (C) 2019 Microchip Technology Inc.
+# Padmarao Begari <padmarao.begari@microchip.com>
+#
+
+obj-y	+= mpfs_icicle.o