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/common/cmd_mii.c b/common/cmd_mii.c
index fa753dd..bcbd7aa 100644
--- a/common/cmd_mii.c
+++ b/common/cmd_mii.c
@@ -306,7 +306,7 @@
 		return 1;
 	}
 
-#if defined(CONFIG_8xx) || defined(CONFIG_MCF532x) || defined(CONFIG_MII_INIT)
+#if defined(CONFIG_MII_INIT)
 	mii_init ();
 #endif