x86/xen: split off mmu_pv.c

Basically, mmu.c is renamed to mmu_pv.c and some code moved out to common
mmu.c.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
3 files changed