arm: rmobile: Add Stout board support

Stout is an entry level development board based on R-Car H2 SoC (R8A7790)

This commit supports the following peripherals:
- SCIFA, I2C, Ethernet, QSPI, SDHI0/2, CPLD

Signed-off-by: Vladimir Barinov <vladimir.barinov@cogentembedded.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/configs/stout_defconfig b/configs/stout_defconfig
new file mode 100644
index 0000000..fbfe919
--- /dev/null
+++ b/configs/stout_defconfig
@@ -0,0 +1,21 @@
+CONFIG_ARM=y
+CONFIG_RMOBILE=y
+CONFIG_TARGET_STOUT=y
+# CONFIG_CMD_BDI is not set
+# CONFIG_CMD_CONSOLE is not set
+# CONFIG_CMD_BOOTD is not set
+# CONFIG_CMD_IMI is not set
+# CONFIG_CMD_IMLS is not set
+# CONFIG_CMD_XIMG is not set
+# CONFIG_CMD_ENV_EXISTS is not set
+# CONFIG_CMD_LOADB is not set
+# CONFIG_CMD_FLASH is not set
+# CONFIG_CMD_FPGA is not set
+# CONFIG_CMD_ECHO is not set
+# CONFIG_CMD_ITEST is not set
+# CONFIG_CMD_SOURCE is not set
+# CONFIG_CMD_SETEXPR is not set
+# CONFIG_CMD_MISC is not set
+CONFIG_SPI_FLASH=y
+CONFIG_SPI_FLASH_BAR=y
+CONFIG_SH_SDHI=y