rockchip: rk3128: add evb-rk3128 support

evb-rk3128 is an evb from Rockchip based on rk3128 SoC:
- 2 USB2.0 Host port;
- 1 HDMI port;
- 2 10/100M eth port;
- 2GB ddr;
- 16GB eMMC;
- UART to USB debug port;

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
diff --git a/board/rockchip/evb_rk3128/Kconfig b/board/rockchip/evb_rk3128/Kconfig
new file mode 100644
index 0000000..5b3095a
--- /dev/null
+++ b/board/rockchip/evb_rk3128/Kconfig
@@ -0,0 +1,15 @@
+if TARGET_EVB_RK3128
+
+config SYS_BOARD
+	default "evb_rk3128"
+
+config SYS_VENDOR
+	default "rockchip"
+
+config SYS_CONFIG_NAME
+	default "evb_rk3128"
+
+config BOARD_SPECIFIC_OPTIONS # dummy
+	def_bool y
+
+endif