drm/amdgpu/virt: change AI ack-irq message to debug level

Change message to debug level as VI does.
Signed-off-by: NXiangliang Yu <Xiangliang.Yu@amd.com>
Reviewed-by: NMonk Liu <Monk.Liu@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/mxgpu_ai.c

@@ -213,7 +213,7 @@ static int xgpu_ai_mailbox_ack_irq(struct amdgpu_device *adev,
 					struct amdgpu_irq_src *source,
 					struct amdgpu_iv_entry *entry)
 {
-	printk("get ack intr and do nothing.\n");
+	DRM_DEBUG("get ack intr and do nothing.\n");
 	return 0;
 }