Correct SPL use of TEE

This converts 1 usage of this option to the non-SPL form, since there is
no SPL_TEE defined in Kconfig

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/tee.h b/include/tee.h
index 13f6096..ab0c583 100644
--- a/include/tee.h
+++ b/include/tee.h
@@ -328,7 +328,7 @@
  * Returns a probed TEE device of the first TEE device matched by the
  * match() callback or NULL.
  */
-#if CONFIG_IS_ENABLED(TEE)
+#if IS_ENABLED(CONFIG_TEE)
 struct udevice *tee_find_device(struct udevice *start,
 				int (*match)(struct tee_version_data *vers,
 					     const void *data),