sunxi: psci: refactor register access to separate functions

This is to prepare for R528, which does not have the typical
"CPUCFG" block; it has a "CPUX" block which provides these
same functions but is organized differently.

Moving the hardware-access bits to their own functions separates the
logic from the hardware so we can reuse the same logic.

Signed-off-by: Sam Edwards <[email protected]>
Reviewed-by: Andre Przywara <[email protected]>

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