drm/xe/vf: Do not disable VF migration on ATS-M

Our current support for the VF migration depends on the availability
of the MEMIRQ rather than specific graphics version 20.

Relax our early migration support checks to allow also use some older
platforms like ATS-M for experiments and testing.

Do not allow ADL, as supporting VF migration through MMIO interrupts
would require additional changes in order to achieve reliability.

Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Signed-off-by: Tomasz Lis <tomasz.lis@intel.com>
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://lore.kernel.org/r/20251021224817.1593817-5-tomasz.lis@intel.com

Author: tomaszli

drivers/gpu/drm/xe/xe_sriov_vf.c

@@ -164,10 +164,9 @@ static void vf_migration_init_early(struct xe_device *xe)
 		return xe_sriov_vf_migration_disable(xe,
 				"experimental feature not available on production builds");
 
-	if (GRAPHICS_VER(xe) < 20)
-		return xe_sriov_vf_migration_disable(xe,
-				"requires gfx version >= 20, but only %u found",
-				GRAPHICS_VER(xe));
+	if (!xe_device_has_memirq(xe))
+		return xe_sriov_vf_migration_disable(xe, "requires memory-based IRQ support");
+
 }
 
 /**