ARM: rockchip: Add rv1108-elgin-r1 board support

Add the initial support for Elgin R1 board, which is based on the
RV1108 SoC and has the following features currently supported in
U-Boot:

- UART
- eMMC
- USB

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
diff --git a/board/elgin/elgin_rv1108/Kconfig b/board/elgin/elgin_rv1108/Kconfig
new file mode 100644
index 0000000..be92431
--- /dev/null
+++ b/board/elgin/elgin_rv1108/Kconfig
@@ -0,0 +1,15 @@
+if TARGET_ELGIN_RV1108
+
+config SYS_BOARD
+	default "elgin_rv1108"
+
+config SYS_VENDOR
+	default "elgin"
+
+config SYS_CONFIG_NAME
+	default "elgin_rv1108"
+
+config BOARD_SPECIFIC_OPTIONS # dummy
+	def_bool y
+
+endif