[v2] powerpc: configs: Add Skiroot defconfig

[Michael Ellerman]

On Wed, 2017-10-04 at 04:23:24 UTC, Joel Stanley wrote:
> This configuration is used by the OpenPower firmware for it's
> Linux-as-bootloader implementation. Also known as the Petitboot kernel,
> this configuration broke in 4.12 (CPU_HOTPLUG=n), so add it to the
> upstream tree in order to get better coverage.
> 
> Signed-off-by: Joel Stanley <joel at jms.id.au>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/c3dda4b0db9cf5044010e4de88e5e5

cheers