Docstring for git fetcher is missing destsuffix and subpath parameters,
so add them
(Bitbake rev: 7cea6c2efefbb0f789f654c04a61d9ba770c148b)
Signed-off-by: Julien Stephan <jstephan@baylibre.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>