board: freescale: t208xrdb: fdt fixups under DM_ETH

Disable the FMan mEMAC 5 and 6 nodes from the fdt since they are not
available under the supported RCW. Also disable the associated
"fsl,dpa-ethernet" nodes that reference them.

This is a simplified version of the fdt_fixup_fman_ethernet call for
use under DM_ETH.

Signed-off-by: Camelia Groza <camelia.groza@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/board/freescale/t208xrdb/t208xrdb.c b/board/freescale/t208xrdb/t208xrdb.c
index a184598..7ccb205 100644
--- a/board/freescale/t208xrdb/t208xrdb.c
+++ b/board/freescale/t208xrdb/t208xrdb.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright 2009-2013 Freescale Semiconductor, Inc.
+ * Copyright 2021 NXP
  */
 
 #include <common.h>
@@ -137,6 +138,8 @@
 #ifdef CONFIG_SYS_DPAA_FMAN
 #ifndef CONFIG_DM_ETH
 	fdt_fixup_fman_ethernet(blob);
+#else
+	fdt_fixup_board_fman_ethernet(blob);
 #endif
 	fdt_fixup_board_enet(blob);
 #endif