Handle input method switch properly for inline suggestions

Expired the old response while received input method subtype changed.
When user next tap on an autofill field, trigger a new fill request for
the new input method.

Bug: 150483555
Test: manual switch imput method
Test: atest CtsAutoFillServiceTestCases
Change-Id: I97be067db3a79d2481c05aeb59875ec24514199d