arm64: dts: rockchip: Drop unneeded address+size-cells on px30

arm64: dts: rockchip: Drop unneeded address+size-cells on px30

On nodes with compatible "rockchip,px30-usb2phy-grf", the #address-cells
and #size-cells are required and consequently their child nodes should
have unit addresses. That is not the case for the px30-pmugrf and
px30-grf nodes, so remove them there.

This fixes the following DTB validation warnings:

  unnecessary #address-cells/#size-cells without "ranges",
  "dma-ranges" or child "reg" property

Signed-off-by: Diederik de Haas <didi.debian@cknow.org>
Link: https://lore.kernel.org/r/20250709132323.128757-10-didi.debian@cknow.org
Signed-off-by: Heiko Stuebner <heiko@sntech.de>