Don't run autoFill on detached view or mode=manual

We only run autoFill on views that are attached, auto-fillable, not
auto-fill blocked, resolvedMode=auto and focused. If any of the
conditions change we have to re-evaluate the auto-fill state.

This reverts commit e572989b.

Test: Ran amended ViewAttributesTest, set a PIN for the device
      (previously crashed)
Bug: 35701500
Change-Id: Idcdf1fd7b7dee6bfbc800fb84fdc1c72dcb088f9