refactor(tc): update platform tests

Update the TC's platform test Makefile and related common definitions
to correspond to newer TF-M code (commit hash: 4ab7a20).

Change-Id: I6ef3effe194a780a0533f9c0c2eab9d0f4efc1fc
Signed-off-by: David Vincze <david.vincze@arm.com>
3 files changed