gstreamer1.0-omx: use mulitple SCMs to fetch submodules
The gstreamer omx package uses a submodule 'common' which
is fetched by the configure script. This approach fails
on non-network builds as the fetcher tries to look upstream
for the submodule.
We now use multiple SCMs, one for the main omx package and
the other for the 'common' submodule so it is available in
the downloads_dir for later use.
Signed-off-by: Awais Belal <awais_belal@mentor.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
