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Create /dev/efidev to provide an ioctl interface to

Description

Create /dev/efidev to provide an ioctl interface to
userland. It supports userland interfaces to UEFI Runtime Services. This is
indended to the the MI portion of EFI RuntimeServices support.

Differential Revision: https://reviews.freebsd.org/D8128
Reviewed by: kib@, wblock@, Ganael Laplanche