Building without PIE support seems broken upstream, enable it by default
to match the configuration others evidently use.
Tweak git submodule option to match upstream.
Drop backported/merged patches, refresh others.
(From OE-Core rev: ede1b86e663f1cafccc8aa8c35fa13ebd3f55d11)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>