[PATCH v2] powernv: Add OPAL soft-poweroff routine

[Stewart Smith]

Joel Stanley <joel at jms.id.au> writes:
> Register a notifier for a OPAL message indicating that the machine
> should prepare itself for a graceful power off.
>
> OPAL will tell us if the power off is a reboot or shutdown, but for now
> we perform the same orderly_poweroff action.
>
> Signed-off-by: Joel Stanley <joel at jms.id.au>

I merged the firmware side of things, this looks like it implements what
firmware exports.

Acked-by: Stewart Smith <stewart at linux.vnet.ibm.com>