Reduce number of TIME_TICK broadcasts

SysUI was registering too many TIME_TICK events and
this led to some of them being dropped. Most common
symptom is clock being stuck.

Bug: 116488358
Test: atest KeyguardSliceProviderTest
Test: set calendar events, plug device into a charger
Change-Id: I234b983039fd9917249c7419e71825096f017e3f