Use wakeup reason when FingerPrint sensor wakes up the device

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)
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/FingerprintUnlockController.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/FingerprintUnlockController.java
index 2912963..7135836 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/FingerprintUnlockController.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/FingerprintUnlockController.java
@@ -173,7 +173,7 @@
             if (DEBUG_FP_WAKELOCK) {
                 Log.i(TAG, "fp wakelock: Authenticated, waking up...");
             }
-            mPowerManager.wakeUp(SystemClock.uptimeMillis());
+            mPowerManager.wakeUp(SystemClock.uptimeMillis(), "android.policy:FINGERPRINT");
         }
         releaseFingerprintWakeLock();
         switch (mMode) {