This is a trivial and hopefully obviously correct patch to setup
and teardown the identity mappings the way the rest of arch/i386
does.

My new page table setup code will break some assumptions below so
this is my attempt to keep voyager working.
Signed-off-by: NEric W. Biederman <ebiederm@xmission.com>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>