CHROMIUM: [media] rk3288-vpu: Add suspend/resume handlers

CHROMIUM: [media] rk3288-vpu: Add suspend/resume handlers

Currently the driver does not implement suspend and resume PM ops.
However when system is entering suspend, the driver should prevent
submitting further runs to the hardware and wait for current run to be
finished. To resume playback after leaving sleep state, next run, if
available, must be submitted to the hardware.

This patch adds proper suspend and resume callbacks to handle this.

BUG=chrome-os-partner:38565
TEST=suspend and resume veyron_jerry several times with video playing

Signed-off-by: Tomasz Figa <tfiga@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/263662
Reviewed-by: Pawel Osciak <posciak@chromium.org>
Change-Id: Id07b7d681ef78655879ce77c9705b1c25231df9d
Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Signed-off-by: Yakir Yang <ykk@rock-chips.com>