rockchip: rk3188: add -u-boot.dtsi for rock-rk3188

We should a -u-boot.dtsi for those config need by U-Boot only,
and other part sync with kernel.

Change-Id: I7c9f9c2824b759bcfd7e5c137ca0da207443d5

rockchip: rk3188: add -u-boot.dtsi for rock-rk3188

We should a -u-boot.dtsi for those config need by U-Boot only,
and other part sync with kernel.

Change-Id: I7c9f9c2824b759bcfd7e5c137ca0da207443d553
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>

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