Adding UART test to env tests

Create test case for UART and registering it into the baremetal tests.

Signed-off-by: Gabor Toth <gabor.toth2@arm.com>
Signed-off-by: Gabor Ambrus <gabor.ambrus@arm.com>
Change-Id: I5040005150200eec516ae60b893d62f6259548d3
6 files changed