Reflect the fact hash extension is now part of the core

Summary:
On PHP 7.4, "The hash extension cannot be disabled anymore and is always
an integral part of any PHP build, similar to the date extension."

Reference: https://www.php.net/manual/en/migration74.other-changes.php

Test Plan: Apply devserver role to WindRiver

Reviewers: dereckson

Reviewed By: dereckson

Differential Revision: https://devcentral.nasqueron.org/D2124