[15/n Dispatcher refactor] Remove TouchState from setInputWindows

In this CL we remove direct access to touchState internals from
setInputWindows method.

Bug: 367661487
Bug: 245989146
Test: atest inputflinger_tests
Flag: EXEMPT refactor
Change-Id: Ibdd09f429e2f6d7c365a2b9bd295df21c193910a