kvm: fix compilation on s390
s390 does not have memremap, even though in this particular case it
would be useful.
Signed-off-by: 
Paolo Bonzini <pbonzini@redhat.com>
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s390 does not have memremap, even though in this particular case it
would be useful.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>