Merge branch 'for-rc' of https://git.kernel.org/pub/scm/linux/kernel/git/mzx/devfreq

Pull devfreq changes for v4.13 from MyungJoo Ham.

* 'for-rc' of https://git.kernel.org/pub/scm/linux/kernel/git/mzx/devfreq:
  PM / devfreq: constify attribute_group structures.
  PM / devfreq: tegra: fix error return code in tegra_devfreq_probe()
  PM / devfreq: rk3399_dmc: fix error return code in rk3399_dmcfreq_probe()