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drivers/devfreq: Enable PM_DEVFREQ and DEVFREQ_GOV_SIMPLE_ONDEMAND

Diederik de Haas requested to merge diederik/linux:enable-pm-devfreq into master

This MR consists of 2 commits:

  1. Enable PM_DEVFREQ globally
  2. Make DEVFREQ_GOV_SIMPLE_ONDEMAND builtin on arm64 and armhf

ad 1) While PM_DEVFREQ was disabled in the configuration, it was effectively enabled. So let's make "theory" match reality and enable it (globally).

ad 2) The ARM Mali GPU driver needs a devfreq governor. Making DEVFREQ_GOV_SIMPLE_ONDEMAND builtin makes the ARM Mali GPU driver work OOTB and (surprisingly) yielded a kernel size increase of 0 bytes on an arm64 kernel.

Edited by Diederik de Haas

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