meta-oniro-staging: mirror create-spdx.bbclass from oe-core

Mirorr create-spdx.bbclass with the following patches included:
https://lists.openembedded.org/g/openembedded-core/message/164408
https://lists.openembedded.org/g/openembedded-core/message/164876

The patches are not yet included in oe-core/kirkstone

Signed-off-by: Davide Gardenal davide.gardenal@huawei.com