board/freescale: add the DM_ETH changes for the PPC DPAA platforms

Add the required changes for compiling with DM_ETH on the PPC
DPAA platforms.

Signed-off-by: Madalin Bucur <madalin.bucur@oss.nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init.c b/arch/powerpc/cpu/mpc85xx/cpu_init.c
index 5a409e7..e0f0f7e 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu_init.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu_init.c
@@ -963,8 +963,10 @@
 #endif
 
 #ifdef CONFIG_FMAN_ENET
+#ifndef CONFIG_DM_ETH
 	fman_enet_init();
 #endif
+#endif
 
 #if defined(CONFIG_NXP_ESBC) && defined(CONFIG_FSL_CORENET)
 	if (pamu_init() < 0)