Ability to choose either suspend counter or /sys/power/wake_lock.

Ability to choose either suspend counter or /sys/power/wake_lock.

Suspend blocker that are kept track of by SystemSuspend can now be
backed by either a ref-counter OR /sys/power/wake_lock interface.

We need /sys/power/wake_[un]lock to export debugging info via
/sys/kernel/debug/wakeup_sources. We do this to preserve the workflow
with existing toolchains.

In the future, we want to keep all native wake lock debugging info in
SystemSuspend. That info will then be exposed directly to our tools.

Debug info in /d/wakeup_sources might be misaligned if there wake locks
with colliding names on the device. There are no such cases in Android
platform or pixel devices.

Bug: 128923994
Test: SystemSuspendV1_0UnitTest
Test: device suspends if left alone
Test: /d/wakeup_sources keeps track of all native wake locks
Change-Id: I7d15fca42efca945122ec0671f424e75e186f5d8