miiphy.h: Remove CONFIG_DM_xxx guards

Function prototypes must not be guarded with ifdef tests.  Doing so
prevents us from doing:
if (CONFIG_IS_ENABLED(FOO))
  func();

as that results in a warning when CONFIG_FOO is not enabled.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/miiphy.h b/include/miiphy.h
index 8b77bac..77a0035 100644
--- a/include/miiphy.h
+++ b/include/miiphy.h
@@ -126,8 +126,6 @@
 #define ESTATUS_1000XF		0x8000
 #define ESTATUS_1000XH		0x4000
 
-#ifdef CONFIG_DM_MDIO
-
 /**
  * struct mdio_perdev_priv - Per-device class data for MDIO DM
  *
@@ -185,10 +183,6 @@
  */
 struct phy_device *dm_eth_phy_connect(struct udevice *ethdev);
 
-#endif
-
-#ifdef CONFIG_DM_MDIO_MUX
-
 /* indicates none of the child buses is selected */
 #define MDIO_MUX_SELECT_NONE	-1
 
@@ -206,5 +200,3 @@
 #define mdio_mux_get_ops(dev) ((struct mdio_mux_ops *)(dev)->driver->ops)
 
 #endif
-
-#endif