We are calling xbmkget in the same way, whether it's
a subfile or subrepo.
Rename these variables to subcurl and subgit, so that we
can call xbmkget unconditionally.
Signed-off-by: Leah Rowe <leah@libreboot.org>
i forgot to in the last commit, but it didn't matter because
it just meant that coreboot.git's own download logic kicked
in as a fallback. however, it's better to rely on libreboot's
build system for this, since it has redundancy.
Signed-off-by: Leah Rowe <leah@libreboot.org>