power: Tidy up inclusion of regulator_common.h

This file should not include common.h and dm.h so remove them. Also move
the inclusion of this file to after the normal includes.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
diff --git a/drivers/power/regulator/fixed.c b/drivers/power/regulator/fixed.c
index b5f7aec..2fa6c7e 100644
--- a/drivers/power/regulator/fixed.c
+++ b/drivers/power/regulator/fixed.c
@@ -5,7 +5,6 @@
  *  Przemyslaw Marczak <p.marczak@samsung.com>
  */
 
-#include "regulator_common.h"
 #include <common.h>
 #include <errno.h>
 #include <dm.h>
@@ -13,6 +12,8 @@
 #include <power/pmic.h>
 #include <power/regulator.h>
 
+#include "regulator_common.h"
+
 static int fixed_regulator_ofdata_to_platdata(struct udevice *dev)
 {
 	struct dm_regulator_uclass_platdata *uc_pdata;