Add Kernel Wakelock Stats to SystemSuspend.

Kernel wakelock stats have been migrated from /d/wakeup_sources
to /sys/class/wakeup. We make these stats available to clients
via the SuspendControl AIDL interface, which already reports
native wakelock stats.

Bug: 128923994
Test: SystemSuspendV1_0UnitTest

Change-Id: I41d2e2eec996cf9a7d3e0519d34f4285f5896256
7 files changed