rockchip: Add basic support for evb-rv1108 board

Add basic support for rv1108 evb, whith this patch we
can boot into u-boot console.

Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/board/rockchip/evb_rv1108/Kconfig b/board/rockchip/evb_rv1108/Kconfig
new file mode 100644
index 0000000..4a76e0b
--- /dev/null
+++ b/board/rockchip/evb_rv1108/Kconfig
@@ -0,0 +1,15 @@
+if TARGET_EVB_RV1108
+
+config SYS_BOARD
+	default "evb_rv1108"
+
+config SYS_VENDOR
+	default "rockchip"
+
+config SYS_CONFIG_NAME
+	default "evb_rv1108"
+
+config BOARD_SPECIFIC_OPTIONS # dummy
+	def_bool y
+
+endif