target-ppc: Disentangle find_pte()

target-ppc: Disentangle find_pte()

32-bit and 64-bit hash MMU implementations currently share a find_pte
function.  This results in a whole bunch of ugly conditionals in the shared
function, and not all that much actually shared code.

This patch separates out the 32-bit and 64-bit versions, putting then
in mmu-hash64.c and mmu-has32.c, and removes the conditionals from
both versions.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>