perf/arm_cspmu: Clean up ACPI dependency

Build-wise, the ACPI dependency consists of only a couple of things
which could probably stand being factored out into ACPI helpers anyway.
However for the immediate concern of working towards Devicetree support
here, it's easy enough to make a few tweaks to contain the affected code
locally, such that we can relax the Kconfig dependency.

Reviewed-and-Tested-by: Suzuki K Poulose <[email protected]>
Reviewed-by: Ilkka Koskinen <[email protected]>
Signed-off-by: Robin Murphy <[email protected]>
Link: https://lore.kernel.org/r/9d126711c7498b199b3e6f5cf48ca60ffb9df54c.1685983270.git.robin.murphy@arm.com
Signed-off-by: Will Deacon <[email protected]>

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