systemc: Exclude some failing systemc TLM tests in working.filt.

These are known to fail and are undiagnosed, and so are not "working"
and shouldn't be in included when using the working.filt filter file.

Change-Id: I46e9f880bd4095085e4217ac6bec950cb2af9536
Reviewed-on: https://gem5-review.googlesource.com/c/15066
Reviewed-by: Anthony Gutierrez <anthony.gutierrez@amd.com>
Maintainer: Anthony Gutierrez <anthony.gutierrez@amd.com>

src/systemc/tests/working.filt

@@ -15,6 +15,10 @@ path.startswith("systemc/kernel/phase_callbacks/"),
 
 
 path in (
+    # Fails with undiagnosed output differences.
+    "tlm/bus",
+    "tlm/bus_dmi",
+
     # Uses sc_elab_and_sim.
     "systemc/kernel/sc_main_main",