rockchip: rk3328: add evb-rk3328 support

evb-rk3328 is an evb from Rockchip based on rk3328 SoC:
- 2 USB2.0 Host port;
- 1 USB3.0 Host port;
- 1 HDMI port;
- 2 10/100M eth port;
- 2GB ddr;
- 16GB eMMC;
- UART to USB debug port;

Signed-off-by: William Zhang <william.zhang@rock-chips.com>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Acked-by: Simon Glass <sjg@chromium.org>