envsetup.sh: add groot

   CD to the top of the current git project.

Change-Id: Idd4e8f7abd7d210c57c5ed5b47eaa5a5cc5956cb
Signed-off-by: KhasMek <Boushh@gmail.com>
Merge remote-tracking branch 'aokp/jb-mr1' into jb-mr1