Resolve boot time dependencies related to the power manager.

This change fixes a bug where native daemons may try to communicate
with the power manager before it was fully initialized due to a race
between publishing the binder service and completing init().

The solution was to simplify the dependencies related to the power
manager.  It turns out that most services that were passed in
init are not actually needed until systemReady.  What remained
was a dependency on the activity manager to check permissions for
incoming calls.  So now we start activity manager first.
However, the activity manager also depends on power manager for
wakelocks.  To break the cycle, we now defer initializing the activity
manager's wakelocks until after the power manager has been started.

Cleaned up a bunch of boot-time service dependencies so that we
can have better confidence that they are correctly maintained.

Bug: 13884219
Change-Id: If08e2d7ccd44e7026a72441bb6bd5afd7bb9fffe