powerpc: Move opcode definitions from kvm/emulate.c to asm/ppc-opcode.h

Opcode and xopcode are useful definitions not just for KVM. Move these
definitions to asm/ppc-opcode.h for public use.

Also add the opcodes for LHAUX and LWZUX.

Signed-off-by: Jia Hongtao <hongtao.jia@freescale.com>
Signed-off-by: Li Yang <leoli@freescale.com>
[scottwood@freesacle.com: update commit message and rebase]
Signed-off-by: Scott Wood <scottwood@freescale.com>

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

diff --cc arch/powerpc/kvm/emulate.c
Simple merge