powerpc/mpsc: Set the port device in the mpsc serial driver
powerpc/mpsc: Set the port device in the mpsc serial driver

The mpsc serial driver needx to set the port's device tree element
to register properly.

Signed-off-by: Corey Minyard <97c9634d4bed2779ee3e53c0495565ccc28c2363@mvista.com>
Signed-off-by: Benjamin Herrenschmidt <a7089bb6e7e92505d88aaff006cbdd60cc9120b6@kernel.crashing.org>

KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs