hw/s390x: Replace global smp variables with machine smp properties

hw/s390x: Replace global smp variables with machine smp properties

The global smp variables in s390x are replaced with smp machine properties.

A local variable of the same name would be introduced in the declaration
phase if it's used widely in the context OR replace it on the spot if it's
only used once. No semantic changes.

Signed-off-by: Like Xu <[email protected]>
Message-Id: <20190518205428[email protected]>
Acked-by: Christian Borntraeger <[email protected]>
Reviewed-by: Cornelia Huck <[email protected]>
[ehabkost: fix build failure at VCPU_IRQ_BUF_SIZE]
Signed-off-by: Eduardo Habkost <[email protected]>
fixup! hw/s390x: Replace global smp variables with machine smp properties

Signed-off-by: Eduardo Habkost <[email protected]>