Revert "InputReaderConfiguration: remove old touchpad stack fields"

This reverts commit bef78ed5.

Reason for revert: it depends on
I6be262b8e9272d4ccb4777ce0954886e60fd5c5d, which must be reverted due to
CTS test failures on 25Q3.

Bug: 420320431
Test: $ atest --host inputflinger_tests
Flag: EXEMPT refactor
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:9b9572e3b393a78e3a28d5304d69bac10c96d222)
Merged-In: Ib340df535eb9ceeacc4c73270e976e2d524acfe5
Change-Id: Ib340df535eb9ceeacc4c73270e976e2d524acfe5