ci: Remove remaining TC2 test configs

TC2 platform has been deprecated (TF-A: 49d6e19). Corresponding test
configs for TC3 are already in place and are actively tested.

Change-Id: I0d2d7d6e21f66f2b0832d568cdf2209bd3a1379f
Signed-off-by: David Vincze <david.vincze@arm.com>
4 files changed