net: Drop dm.h header file from phy.h

This header file should not be included in other header files. Remove it
and use other headers and C inclusions instead.

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

include/phy.h

@@ -9,14 +9,17 @@
 #ifndef _PHY_H
 #define _PHY_H
 
-#include <dm.h>
+#include <log.h>
+#include <phy_interface.h>
+#include <dm/ofnode.h>
+#include <dm/read.h>
 #include <linux/errno.h>
 #include <linux/list.h>
 #include <linux/mii.h>
 #include <linux/ethtool.h>
 #include <linux/mdio.h>
-#include <log.h>
-#include <phy_interface.h>
+
+struct udevice;
 
 #define PHY_FIXED_ID		0xa5a55a5a
 #define PHY_NCSI_ID            0xbeefcafe