rockchip: rk3288: Use rk3288.dtsi from dts/upstream

rockchip: rk3288: Use rk3288.dtsi from dts/upstream

rk3288.dtsi from arch/arm/dts is almost identical to the rk3288.dtsi
from dts/upstream, it differs only with a minor change in hdmi port
nodes, something that does not affect U-Boot.

Remove arch/arm/dts/rk3288.dtsi to use rk3288.dtsi from dts/upstream.
Also drop gpio aliases from -u-boot.dtsi that has been part of
rk3288.dtsi for some time.

No functional change to board DTs is intended with this removal.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>