Fix clock translation on lockscreen

make clock counter translation by amount of
getExpandedPreferredClockY to align to screen

Previously reverted due to b/280096103, fix by comparing clockY and
calling updateClockTargetRegions less frequently

Test: manually
Bug: 278413320
Bug: 278456894
Change-Id: I1b133bab62769681d718e273370d319b57e44e98