Devfreq framework supports suspend of its devices.
Call the the devfreq interface and allow devfreq devices
preserve/restore their states during suspend/resume.
Suggested-by: NTobias Jakobi <tjakobi@math.uni-bielefeld.de>
Reviewed-by: NChanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: NLukasz Luba <l.luba@partner.samsung.com>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>