ACPI: processor: reduce CPUFREQ thermal reduction pctg for Tegra241

Current implementation of processor_thermal performs software throttling
in fixed steps of "20%" which can be too coarse for some platforms.
We observed some performance gain after reducing the throttle percentage.
Change the CPUFREQ thermal reduction percentage and maximum thermal steps
to be configurable. Also, update the default values of both for Nvidia
Tegra241 (Grace) SoC. The thermal reduction percentage is reduced to "5%"
and accordingly the maximum number of thermal steps are increased as they
are derived from the reduction percentage.

Signed-off-by: Srikar Srimath Tirumala <[email protected]>
Co-developed-by: Sumit Gupta <[email protected]>
Signed-off-by: Sumit Gupta <[email protected]>
Acked-by: Sudeep Holla <[email protected]>
Acked-by: Hanjun Guo <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>

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