For softmmu builds the interface from the generic code to the target
specific MMU implementation is through the tlb_fill() function.  For ppc
this is currently in mem_helper.c, whereas it would make more sense in
mmu_helper.c.  This patch moves it, which also allows
cpu_ppc_handle_mmu_fault() to become a local function in mmu_helper.c
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
Signed-off-by: NAlexander Graf <agraf@suse.de>