Fix some views not being tracked

Should keep track of all views that attempt to notify the view
entered for the fill dialog. But none of the views are tracked
until the first FillRsponse is obtained, because mTrackedViews
is initialized empty. So move the tracking logic out of
mTrackedViews.

Bug: 274067633
Test: atest CtsAutoFillServiceTestCases
Change-Id: Ic93324b57ca527a2c3e311260593f454eefeeed3