git: update to v2.0.1

git: update to v2.0.1

Also fetch source code from kernel.org. As per the Git release announcement, see
[1], Git source tarball are now located back on kernel.org, at [2].

[1] https://lkml.org/lkml/2014/6/25/760
[2] https://www.kernel.org/pub/software/scm/git/

Signed-off-by: Nicolas Dechesne <nicolas.dechesne@linaro.org>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>