validation: Pass in chainstate to ::CheckSequenceLocks

Summary:
This is a backport of core#20750 [6/17]
https://github.com/bitcoin/bitcoin/pull/20750/commits/4c15942b79c46256950df17c348302679e668ebc

Test Plan: ninja all check-all

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D11192