PowerManager can log into BatteryStats the reason for the device being
woken up. This change has the Fingerprint controller report the reason
instead of a default non-descriptive 'wakeUp' reason.
Bug:26209577
Change-Id: I12d80682dad888add139cca586d4b948e9d546e5
(cherry picked from commit 5bcb8bb31ab6688dff432cb7bd20fe69016c7003)