scripts/buildhelper: do special task before common
scripts/buildhelper: do special task before common

Update the order of special tasks and common tasks to see whether it
successfully builds SDK's before bundles.

Signed-off-by: Jens Rehsack <69d49c504a9219a55b8be0f905e8fe3c32ffb57f@netbsd.org>

rehsack/meta-jens,rehsack/meta-jens,rehsack/meta-jens