kvm: Iterate over only vcpus that are preempted

This helps in filtering out the eligible candidates further and
thus potentially helps in quickly allowing preempted lockholders to run.
Note that if a vcpu was spinning during preemption we filter them
by checking whether they are preempted due to pause loop exit.

Reviewed-by: Chegu Vinod <[email protected]>
Reviewed-by: Marcelo Tosatti <[email protected]>
Signed-off-by: Raghavendra K T <[email protected]>
Signed-off-by: Gleb Natapov <[email protected]>

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