Add CONFIG_MII_INIT support to related boards

Replace CONFIG_8xx and CONFIG_MCF532x to CONFIG_MII_INIT in
cmd_init.c. Add CONFIG_MII_INIT to board configuration files
that use mii_init() in cmd_init.c.

Signed-off-by: TsiChung Liew <Tsi-Chung.Liew@freescale.com>
Acked-by: Ben Warren <biggerbadderben@gmail.com>
diff --git a/include/configs/NETTA.h b/include/configs/NETTA.h
index 945f47f..20404a3 100644
--- a/include/configs/NETTA.h
+++ b/include/configs/NETTA.h
@@ -97,6 +97,7 @@
 #define	FEC_ENET		1	/* eth.c needs it that way... */
 #undef  CFG_DISCOVER_PHY		/* do not discover phys */
 #define CONFIG_MII		1
+#define CONFIG_MII_INIT		1
 #define CONFIG_RMII		1	/* use RMII interface */
 
 #if defined(CONFIG_NETTA_ISDN)