tests/functional: Introduce a specific test for romulus-bmc machine

This simply moves the romulus-bmc test to a new test file. No changes
in the test. The do_test_arm_aspeed routine is removed from the
test_arm_aspeed.py file because it is now unused.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Link: https://lore.kernel.org/r/20241206131132.520911-4-clg@redhat.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

tests/functional/test_arm_aspeed_romulus.py

@@ -0,0 +1,24 @@
+#!/usr/bin/env python3
+#
+# Functional test that boots the ASPEED machines
+#
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+from qemu_test import Asset
+from aspeed import AspeedTest
+
+class RomulusMachine(AspeedTest):
+
+    ASSET_ROMULUS_FLASH = Asset(
+        ('https://github.com/openbmc/openbmc/releases/download/2.9.0/'
+         'obmc-phosphor-image-romulus.static.mtd'),
+        '820341076803f1955bc31e647a512c79f9add4f5233d0697678bab4604c7bb25')
+
+    def test_arm_ast2500_romulus_openbmc_v2_9_0(self):
+        image_path = self.ASSET_ROMULUS_FLASH.fetch()
+
+        self.do_test_arm_aspeed('romulus-bmc', image_path)
+
+
+if __name__ == '__main__':
+    AspeedTest.main()