dma: do not depend on kvm_enabled()
Memory barriers are needed also by Xen and, when the ioeventfd
bugs are fixed, by TCG as well.
sysemu/kvm.h is not anymore needed in sysemu/dma.h, move it to
the actual users.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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