arm: rmobile: Add support gose board

The gose board has R8A7793, 1GB DDR3-SDRAM, USB, Ethernet, and more.
This patch supports the following functions:
 - DDR3-SDRAM
 - SCIF
 - QSPI
 - SPI

Signed-off-by: Hisashi Nakamura <hisashi.nakamura.ak@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
CC: Masahiro Yamada <yamada.m@jp.panasonic.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/configs/gose_defconfig b/configs/gose_defconfig
new file mode 100644
index 0000000..54a56f5
--- /dev/null
+++ b/configs/gose_defconfig
@@ -0,0 +1,3 @@
+CONFIG_ARM=y
+CONFIG_RMOBILE=y
+CONFIG_TARGET_GOSE=y