Eagerly update ClockSize & isLargeClockVisible flows

This should fix an issue where both clocks would appear on mokey. It
appears that the isLargeClockVisible may not be always subscribed on
mokey/aosp.

Bug: 327249281
Test: Mostly presubmits, having a hard time reproducing
Flag: com.android.systemui.migrate_clocks_to_blueprint
Change-Id: I4c7edab90b11e8b7e3de1538413466d50f675779