cpuidle: lpm-levels: Log sched bias reason in trace

Update the reason for cpuidle state selection as scheduler
bias in case bias timer is set. Make use of unused next_event_us
parameter to replace with cpu bias status.

Change-Id: I42950b3d9d85da0ec5245c9cdbc7bcc5d609be3d
Signed-off-by: Maulik Shah <quic_mkshah@quicinc.com>