scripts: requirements: extras: add spsdk

Secure Provisioning SDK (SPSDK) is a unified, reliable,
and easy to use Python SDK library working across the
NXP MCU portfolio providing a strong foundation from
quick customer prototyping up to production deployment.

Docs: https://spsdk.readthedocs.io



Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: Jiafei Pan <Jiafei.Pan@nxp.com>