[fallback] For HD() device paths, use just the media node and later.

UEFI 2.x section 3.1.2 provides for "short-form device path", where the
first element specified is a "hard drive media device path", so that you
can move a disk around on different buses without invalidating your
device path.  Fallback has not been using this option, though in most
cases efibootmgr has.

Note that we still keep the full device path, because LoadImage()
isn't necessarily the layer where HD() works - one some systems BDS is
responsible for resolving the full path and passes that to LoadImage()
instead.  So we have to do LoadImage() with the full path.

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