Fix a race in setExplicitHealthCheckEnabled() (4/n)

Sometimes the property change callback is not called within the
sleep timeout. Let's call updateConfigs() to apply device config
changes immediately to eliminate the race condition.

Bug: 178675924
Test: atest PackageWatchdogTest
Change-Id: I2b3ce79eac36cfc5ef98a62750142bb6d936e043