Fix flakey KeyguardIndicationControllerTest

The test in question would pass only when the device was
not charging, because the KeyguardIndicationController registers
itself with the KeyguardUpdateMonitor and shows indications when
the device starts charging.

Fixed by not registering the controller with the KeyguardUpdateMonitor
and instead driving the controller's callback directly.

Change-Id: I6828a97a36572be9e7520ce9a82afddf474d4008
Fixes: 36211361
Test: runtest -x frameworks/base/packages/SystemUI/tests/src/com/android/systemui/statusbar/KeyguardIndicationControllerTest.java -m transientIndication_releasesWakeLock_afterHidingDelayed