Update the sh73a0 specific CPU Hotplug code to make use of
the recently introduced shared SCU functions. The sh73a0
power control hardware relies on SCU_PM_POWEROFF with WFI
so the shared SCU code will as-is power down the hardware
as expected.
Signed-off-by: NMagnus Damm <damm@opensource.se>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>