Make functions in validation.cpp static and pass chainparams

Summary:
Fix bugs as per PR comment

Change bool static to static bool

Backport core's PR10201

Test Plan:

make check
./test/functional/test_runner.py --extended

Reviewers: #bitcoin_abc, jasonbcox

Reviewed By: #bitcoin_abc, jasonbcox

Subscribers: jasonbcox, matiu, teamcity

Differential Revision: https://reviews.bitcoinabc.org/D1041