soc: imx: gpcv2: move register access table to domain data

The valid register ranges are defined by the implemented power domains,
which are different between the individual SoCs where the GPCv2 is used.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>