Fix typos in the files that are owned by the project.

Bring back a "duplicate word" removal (node node), which should have
been "node Node", the second "node" is not capitalized in the reference
file (yet).  We'll bring it back capitalized to avoid it from triggering
automated checking scripts and possibly reverting this change again.  A
few other typos were not fixed, as we strive to keep as close to the
reference files as possible, these fixes should be submitted to the
reference project (tianocore/edk2) in the not so distant future.

Reviewed by: imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/1894

Add a 'g' flag to allow the replacement to occur more than once on the
same line.

Reviewed by:	imp, emaste
Approved by:	emaste (mentor)
Differential Revision:	https://reviews.freebsd.org/D49058

Apply uncrustify changes to .c/.h files.

Reduce the diffs with EDK2 to aid with future merges.  The
unconventional way we've imported this code makes using a vendor branch
to manage it at the very least tricky. Update FreeBSD-update to reflect
the slight shift in advise.

Reviewed by:	imp
Upstream Bug:	https://bugzilla.tianocore.org/show_bug.cgi?id=3737
Obtained from:	https://github.com/tianocore/edk2/commit/2f88bd3a1296c522317f1c21377876de63de5be7
Pull Request:   https://github.com/freebsd/freebsd-src/pull/581

This commit implements the (mostly?) Linux compatible
efidp_format_device_path and efidp_parse_device_path APIs. These are
the only APIs exposed through this library. However, they are built on
code from Tianocore's EDK2 MdePkg. They are brought in as new files
here for reasons described in FreeBSD-update.

Symbol versioning will be introduced to control what's exported from
the EDK2 code.

Some structural changes may be necessary when we move to sharing with
sys/boot/efi.

Sponsored by: Netflix