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

This simply moves the rainier-bmc test to a new test file. No changes
in the test. The test_arm_aspeed.py is deleted.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Link: https://lore.kernel.org/r/20241206131132.520911-7-clg@redhat.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
2 files changed