arm64: dts: rockchip: adapt regulator nodenames to preferred form

The preferred nodename for fixed-regulators has changed to
pattern: '^regulator(-[0-9]+v[0-9]+|-[0-9a-z-]+)?$'

Fix all Rockchip DT regulator nodenames.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Link: https://lore.kernel.org/r/0ae40493-93e9-40cd-9ca9-990ae064f21a@gmail.com


[adapted rebased on top of a number of other changes and included
 neu6a-wifi + wolfvision-pf5-io-expander overlays]
Signed-off-by: Heiko Stuebner <heiko@sntech.de>