Make the notification of JIT zygote completion its own task.

Now that we are compiling two boot image in memory (because there are
two profiles), we were creating two tasks that were doing the same
thing. The JIT only expects one execution of the task, so make the
reporting its own task.

Test: boot with JIT zygote
Bug: 220702556
Bug: 221093821
Change-Id: I434284f9acc0f99fa90e1821071b2736031d2504
3 files changed