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efirt: When present, attempt to use EFI runtime services to shutdown

Description

efirt: When present, attempt to use EFI runtime services to shutdown

PR: maybe related to 233998 (inconclusive at this time)
Submitted by: byuu <byuu AT tutanota.com> (previous version)
Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D18506