dmaengine: rcar-dmac: Make DMAC reinit during system resume explicit
The current (empty) system sleep callbacks rely on the PM core to force
a runtime resume to reinitialize the DMAC registers during system
resume. Without a reinitialization, e.g. SCIF DMA will hang silently
after a system resume on R-Car Gen3.
Make this explicit by using pm_runtime_force_{suspend,resume}() as the
system sleep callbacks instead. Use SET_LATE_SYSTEM_SLEEP_PM_OPS() as
DMA engines must be initialized before all DMA slave devices.
Fixes: 17218e0092f8 "PM / genpd: Stop/start devices without pm_runtime_force_suspend/resume()" Suggested-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Acked-by: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>