Move to CMake 3.20.0.
At the Toolchain WG it was decided to move to CMake 3.20.0.
The main reason for increasing CMake version is better toolchain
support.
Better toolchain support is added in the following CMake versions:
- armclang, CMake 3.15
- Intel oneAPI, CMake 3.20
- IAR, CMake 3.15 and 3.20
Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>
Add two testcases to test semaphore feature on system side. For example,
test semaphore usage and sync process between different priority threads
to verify the semaphore can be take by higher priority thread, and give
sem more than max value of semaphore that set in init step to verify sem
count is correct or not.
Signed-off-by: Jian Kang <jianx.kang@intel.com>
