am335x_evm: prepare for eth driver model support

Prepare board file so that ethernet registration are
commented for DM conversion

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/board/ti/am335x/board.c b/board/ti/am335x/board.c
index 1dc2ed0..f0cb1e2 100644
--- a/board/ti/am335x/board.c
+++ b/board/ti/am335x/board.c
@@ -38,7 +38,10 @@
 /* GPIO that controls power to DDR on EVM-SK */
 #define GPIO_DDR_VTT_EN		7
 
+#if defined(CONFIG_SPL_BUILD) || \
+	(defined(CONFIG_DRIVER_TI_CPSW) && !defined(CONFIG_DM_ETH))
 static struct ctrl_dev *cdev = (struct ctrl_dev *)CTRL_DEVICE_BASE;
+#endif
 
 /*
  * Read header information from EEPROM into global structure.
@@ -513,6 +516,8 @@
 }
 #endif
 
+#ifndef CONFIG_DM_ETH
+
 #if (defined(CONFIG_DRIVER_TI_CPSW) && !defined(CONFIG_SPL_BUILD)) || \
 	(defined(CONFIG_SPL_ETH_SUPPORT) && defined(CONFIG_SPL_BUILD))
 static void cpsw_control(int enabled)
@@ -670,3 +675,5 @@
 	return n;
 }
 #endif
+
+#endif /* CONFIG_DM_ETH */