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/mmc/gen_atmel_mci.c b/drivers/mmc/gen_atmel_mci.c
index c25d9ed..d883da3 100644
--- a/drivers/mmc/gen_atmel_mci.c
+++ b/drivers/mmc/gen_atmel_mci.c
@@ -11,6 +11,7 @@
 
 #include <common.h>
 #include <clk.h>
+#include <dm.h>
 #include <mmc.h>
 #include <part.h>
 #include <malloc.h>
@@ -19,7 +20,6 @@
 #include <asm/byteorder.h>
 #include <asm/arch/clk.h>
 #include <asm/arch/hardware.h>
-#include <dm/device.h>
 #include "atmel_mci.h"
 
 DECLARE_GLOBAL_DATA_PTR;