Update poky to what will be the yocto-3.1.12 revision so we have
the officially released version with the BitBake workaround for
the GitHub removal of unauthenticated git protocol access.
Bug-AGL: SPEC-4126, SPEC-4151
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: Ib4bbde5ae6d49d72ee5bd3ef6d4b7ccb429cb2b1