* Implement tests for hipEventCreateWithFlags
- Add hipEventCreateWithFlags.cc with a simple positive unit test
- Divide Unit_hipEventCreate_NullCheck into two separate tests
- Add newly created file into CMakeLists.txt
- Update Unit_hipEventCreateWithFlags_Positive test to include hipEventInterprocess flag
- Add hipEventCreateWithFlags.cc with a simple positive unit test
- Divide Unit_hipEventCreate_NullCheck into two separate tests
Signed-off-by: Nives Vukovic <nives.vukovic@htecgroup.com>