Fix test_dtcs and test_cross skipping

This test has been wrong for a long time, basically never properly
asserting DTCS values for drivers. The three drivers fixed immediately
before this commit should have been caught by this test, but were not
because it was always skipping the dtcs field.

Related to #11506

tests/base.py

@@ -174,15 +174,16 @@ def assertEqualMem(self, a, b, ignore=None):
                                         (a.tmode == "Cross" and
                                          rx_mode == "Tone"))):
                 continue
-            elif k == "dtcs" and not (
-                    (a.tmode == "DTCS" and not self.rf.has_rx_dtcs) or
-                    (a.tmode == "Cross" and tx_mode == "DTCS") or
-                    (a.tmode == "Cross" and rx_mode == "DTCS" and
-                     not self.rf.has_rx_dtcs)):
+            elif k == "dtcs" and (a.tmode != 'DTCS' or
+                                  (a.tmode == 'Cross' and tx_mode != 'DTCS')):
+                # If we are not in a tmode where a transmit DTCS code is
+                # required, we do not care if the code is persisted.
                 continue
             elif k == "rx_dtcs" and (not self.rf.has_rx_dtcs or
                                      not (a.tmode == "Cross" and
                                           rx_mode == "DTCS")):
+                # If we are not in a tmode where a receive DTCS code is
+                # required, we do not care if the code is persisted.
                 continue
             elif k == "offset" and not a.duplex:
                 continue