kvm_sys: implement Debug trait for kvm_lapic_state
kvm_sys: implement Debug trait for kvm_lapic_state

This is needed for calling unwrap_err() on Result<kvm_lapic_state, Error>.

Signed-off-by: Constantin Musca <e6b0bba089ab6d3e8fde8b62faae63e6b21d7743@amazon.com>

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