FreeBSD UEFI boot loader updates

FreeBSD 11.0-stable just cane out, with 2 changes to the UEFI boot loader:

* The UEFI boot loader has been updated for build reproducibility. [r305845] (Sponsored by The FreeBSD Foundation)

* The EFI loader has been updated to support TFTPFS, providing netboot support without requiring an NFS server. [r307632] (Sponsored by Gandi.net)

https://www.freebsd.org/relnotes/11-STABLE/relnotes/article.html