arm: rmobile: Add SILK board support

SILK is an entry level development board based on R-Car E2 SoC (R8A7794)

This commit supports the following peripherals:
- SCIF, I2C, Ethernet, QSPI, MMC, USB Host

Signed-off-by: Vladimir Barinov <vladimir.barinov@cogentembedded.com>
Reviewed-by: Tom Rini <trini@ti.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/board/renesas/silk/Makefile b/board/renesas/silk/Makefile
new file mode 100644
index 0000000..e6eea61
--- /dev/null
+++ b/board/renesas/silk/Makefile
@@ -0,0 +1,10 @@
+#
+# board/renesas/silk/Makefile
+#
+# Copyright (C) 2015 Renesas Electronics Corporation
+# Copyright (C) 2015 Cogent Embedded, Inc.
+#
+# SPDX-License-Identifier: GPL-2.0
+#
+
+obj-y	:= silk.o qos.o ../rcar-gen2-common/common.o