Log the duration of executing all receivers of LOCKED_BOOT_COMPLETED or BOOT_COMPLETED broadcast.

The dispatch latency is the dispatchTime - enqueueTime.
The completion latency is the completionTime - enqueueTime.

Bug: 221320741
Test: after reboot and unlock device, grep BOOT_COMPLETED_BROADCAST_COMPLETION_LATENCY_REPORTED in adb logcat ouput.
Change-Id: If2d91c9cea30228518ff7a5229de2dcbee28c9cc