Add the acpi_get_features() method. This method is called on child drivers

to see what features they may support before calling identify/probe/attach.
This is necessary because the ACPI 3.0 spec requires driver support be
advertised before running any methods.  For now, the flags are as specified
in for the _PDC and _OSC methods but we can support private flags as needed.

Add an implementation of this for acpi_cpu.  It checks all its children
(notably cpufreq drivers) and calls the _PDC method to report the results.

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