powerpc: conditionally compile platform-specific serial drivers

[Michael Ellerman]

On Tue, 2017-06-27 at 14:29:51 UTC, Hannes Reinecke wrote:
> mpsc.c and mpc52xx-psc.c are platform-specific serial drivers, and
> should be compiled for the respective platforms only.
> 
> Signed-off-by: Hannes Reinecke <hare at suse.com>
> Reviewed-by: Torsten Duwe <duwe at suse.de>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/866bfc75f40e4f8a00d268f73f3a02

cheers