KVM: PPC: Revert "KVM: PPC: Use kernel hash function"

It turns out the in-kernel hash function is sub-optimal for our subtle
hash inputs where every bit is significant. So let's revert to the original
hash functions.

This reverts commit 05340ab4f9a6626f7a2e8f9fe5397c61d494f445.

Signed-off-by: Alexander Graf <agraf@suse.de>

diff --cc arch/powerpc/kvm/book3s_32_mmu_host.c
Simple merge

diff --cc arch/powerpc/kvm/book3s_64_mmu_host.c
Simple merge