fix: omit generating smmu traces

Remove the dependency to the generic trace plugin to test configs where
the SMMU is exercised.

The generic trace was used mostly for printing debug trace while
developing tests but not required for the tests to run.

Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: I29a33e88074617aaac78b57b0e8c4f7848e23850
1 file changed