Earlier chips only had two performance levels, but newer
ones potentially had more.  The message is harmless.  Drop the
message to avoid spamming the log.

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1874Reviewed-by: NEvan Quan <evan.quan@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>