Introduce a new method, cpufreq_drv_type(), that returns the type of the

driver.  This used to be handled by cpufreq_drv_settings() but it's
useful to get the type/flags separately from getting the settings.
(For example, you don't have to pass an array of cf_setting just to find
the driver type.)

Use this new method in our in-tree drivers to detect reliably if acpi_perf
is present and owns the hardware.  This simplifies logic in drivers as well
as fixing a bug introduced in my last commit where too many drivers attached.

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