Disallow system_server to read sysfs_wakeup_reason

As SystemSuspend will provide wakeup reasons along with wakeup
notification, it is no longer needed for BatteryStats, which lives
on system_server to access the kernel wakeup reason file.

Test: adb logcat -b all -d | audit2allow -p policy
Bug: 171021049
Change-Id: Idfbc7bb6f9a68d70ac89bfe838cda06739de403c
1 file changed