cpuid: Don't test 486 and pentium with TCG

The CPUID test kernel uses CMOV, pentium and 486 don't have it enabled,
and the test kernel will crash. Skip those CPu models by now.
Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>

qemu/tests/cfg/qemu_cpu.cfg

@@ -127,6 +127,11 @@
             enable_kvm = "no"
             disable_kvm = "yes"
 
+    nokvm:
+        #KNOWN BUG: For some reason, the CPUID test kernel crashes when using
+        # -cpu 486 or pentinum with TCG, so skip them
+        no 486, pentium
+
     variants:
         - check_models:
             test_type = "test_qemu_cpu_models_list"