dm: Use dm.h header when driver mode is used

This header includes things that are needed to make driver build. Adjust
existing users to include that always, even if other dm/ includes are
present

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/pinctrl/nxp/pinctrl-imx7ulp.c b/drivers/pinctrl/nxp/pinctrl-imx7ulp.c
index 5f01175..1f81a66 100644
--- a/drivers/pinctrl/nxp/pinctrl-imx7ulp.c
+++ b/drivers/pinctrl/nxp/pinctrl-imx7ulp.c
@@ -6,7 +6,7 @@
  * SPDX-License-Identifier:	GPL-2.0+
  */
 
-#include <dm/device.h>
+#include <dm.h>
 #include <dm/pinctrl.h>
 
 #include "pinctrl-imx.h"