drm/xe/client: bo->client does not need bos_lock

bos_lock is to protect list of bos used by client, it is
not required to protect bo->client so bring it outside of
bos_lock.

Fixes: b27970f3e11c ("drm/xe: Add tracking support for bos per client")
Signed-off-by: Tejas Upadhyay <[e-mail]>
Reviewed-by: Himal Prasad Ghimiray <[e-mail]>
Reviewed-by: Nirmoy Das <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]
Signed-off-by: Nirmoy Das <[e-mail]>
(cherry picked from commit f74fd53ba34551b7626193fb70c17226f06e9bf1)
Signed-off-by: Rodrigo Vivi <[e-mail]>

drivers/gpu/drm/xe/xe_drm_client.c

···
 	XE_WARN_ON(bo->client);
 	XE_WARN_ON(!list_empty(&bo->client_link));
 
-	spin_lock(&client->bos_lock);
 	bo->client = xe_drm_client_get(client);
+	spin_lock(&client->bos_lock);
 	list_add_tail(&bo->client_link, &client->bos_list);
 	spin_unlock(&client->bos_lock);
 }