tests/functional/test_ppc64_pseries: Skip test_ppc64_linux_smt_boot if necessary

The test_ppc64_linux_smt_boot function lacks the set_machine('pseries'),
so this test is currently failing in case the 'pseries' machine has not
been compiled into the binary. Add the check now to fix it.

Message-ID: <20250424085426.663377-1-thuth@redhat.com>
Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

tests/functional/test_ppc64_pseries.py

@@ -63,6 +63,7 @@ class pseriesMachine(QemuSystemTest):
         wait_for_console_pattern(self, self.good_message, self.panic_message)
 
     def test_ppc64_linux_smt_boot(self):
+        self.set_machine('pseries')
         self.vm.add_args('-smp', '4,threads=4')
         self.do_test_ppc64_linux_boot()
         console_pattern = 'CPU maps initialized for 4 threads per core'