Remove deprecated lints from ArcanistXHPASTLinter

Summary: After D9576, LINT_PHP_53_FEATURES and LINT_PHP_54_FEATURES are deprecated. They have been replaced by LINT_PHP_COMPATIBILITY.

Test Plan: arc unit

Reviewers: Blessed Reviewers, epriestley

Reviewed By: Blessed Reviewers, epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9657