drm/xe/tests: Drop unused xe_device_fn typedef

We missed to drop it in commit 50680d1 ("drm/xe/tests: remove
unused leftover xe_call_for_each_device()") so drop it now.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://lore.kernel.org/r/20250613191938.1980-2-michal.wajdeczko@intel.com
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>

Author: mwajdecz

drivers/gpu/drm/xe/tests/xe_pci_test.h

@@ -15,7 +15,6 @@ struct xe_device;
 struct xe_graphics_desc;
 struct xe_media_desc;
 
-typedef int (*xe_device_fn)(struct xe_device *);
 typedef void (*xe_graphics_fn)(const struct xe_graphics_desc *);
 typedef void (*xe_media_fn)(const struct xe_media_desc *);