linux-wrs: validate branches against known revisions
It is possible for the git repository to have commits on branches
that are ahead of the SRCREVs for those branches. Since the
kern tools will simply checkout and build, we can end up building
a different kernel than what is expected.
It is up to the recipe to ensure that the branches are at the
correct commits. To do this, we simply check the current machine
branch against the SRCREV and if they don't match we move the
existing branch and do a checkout at the desired commit.
Note: This probably needs to be disabled with AUTOREV.
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
