Acquire Booting SuspendBlocker during boot

With quiescent boot, the display stays off during boot, so the
Display SuspendBlocker will not keep the device awake during boot.
To make sure that the device does not suspend during boot, acquire
a SuspendBlocker that is held while the device is booting.

Bug: 180866475
Test: atest PowerManagerServiceTest
Change-Id: Iba93ed3b7fd957820ce15d336514dfce8f5a54fa