lpm-levels: Correctly log failure to enter LPM

Log idle exit as failure to enter LPM in the events that
cpu needs to be rescheduled for another task. Return
best level selected.

Change-Id: I25a444682a8f8c9060f426c03e2f183f86d2fa3a
Signed-off-by: Maulik Shah <mkshah@codeaurora.org>
1 file changed