In order to sync rk3288.dtsi from Linux it needed to
move all u-boot specific properties in separate dtsi files.
Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
The rk3288-firefly board have different setting for sdmmc
io, sync then from kernel mainline:
6fbc7275c7a9 Linux 5.2-rc7
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>