round_robin_prev_vcpu and tss_addr to kvm_arch

This patches moves two fields round_robin_prev_vcpu and tss to kvm_arch.

Signed-off-by: Zhang Xiantao <xiantao.zhang@intel.com>
Acked-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
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