rockchip: rk3128: add device tree file

rockchip: rk3128: add device tree file

Add dts binding header for rk3128, files origin from kernel.

Series-Changes: 2
- fix i2c address
- add saradc and usb phy node
- emmc using fifo mode for there is no dma support in rk3128 emmc
- add some clock id in cru.h

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>