ufs: Drop dm.h header file

This header file should not be included in other header files. Remove it
and use a forward declaration instead.

Also drop asm/io.h

Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/ufs/cdns-platform.c

@@ -9,6 +9,7 @@
 #include <common.h>
 #include <dm.h>
 #include <ufs.h>
+#include <asm/io.h>
 #include <dm/device_compat.h>
 #include <linux/bitops.h>
 #include <linux/err.h>

drivers/ufs/ufs.c

@@ -19,9 +19,10 @@
 #include <malloc.h>
 #include <hexdump.h>
 #include <scsi.h>
+#include <asm/io.h>
+#include <asm/dma-mapping.h>
 #include <linux/bitops.h>
 #include <linux/delay.h>
-
 #include <linux/dma-mapping.h>
 
 #include "ufs.h"

drivers/ufs/ufs.h

@@ -2,11 +2,10 @@
 #ifndef __UFS_H
 #define __UFS_H
 
-#include <asm/io.h>
-#include <dm.h>
-
 #include "unipro.h"
 
+struct udevice;
+
 #define UFS_CDB_SIZE	16
 #define UPIU_TRANSACTION_UIC_CMD 0x1F
 #define UIC_CMD_SIZE (sizeof(u32) * 4)