Add uVisor support for priority grouping functions.
Add uVisor support for priority grouping functions.

JonatanAntoni/CMSIS_5,JonatanAntoni/CMSIS_5,ARM-software/CMSIS_5,ARM-software/CMSIS_5,MatthiasHertel80/CMSIS_5,ARM-software/CMSIS_5,JonatanAntoni/CMSIS_5,JonatanAntoni/CMSIS_5,ARM-software/CMSIS_5,MatthiasHertel80/CMSIS_5,MatthiasHertel80/CMSIS_5,ARM-software/CMSIS_5,JonatanAntoni/CMSIS_5,ARM-software/CMSIS_5,JonatanAntoni/CMSIS_5,MatthiasHertel80/CMSIS_5