ARM: dts: rockchip: update cpu supplies on rk3288

The use of cpu0-supply for cpu0 alone is deprecated,
so add cpu-supply to each cpu separately and
update all existing rk3288 boards that use this property.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Link: https://lore.kernel.org/r/20200813180241.14660-1-jbx6244@gmail.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>