powerpc: Remove mtmsrd(), use existing mtmsr()

mtmsr() does the right thing on 32bit and 64bit, so use it everywhere.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --cc arch/powerpc/include/asm/reg.h
Simple merge

diff --cc arch/powerpc/oprofile/op_model_power4.c
Simple merge