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/Adder.h b/include/configs/Adder.h
index 7919991..8a76c26 100644
--- a/include/configs/Adder.h
+++ b/include/configs/Adder.h
@@ -42,6 +42,7 @@
 
 #if defined(CONFIG_ETHER_ON_FEC1) || defined(CONFIG_ETHER_ON_FEC2)
 #define CFG_DISCOVER_PHY
+#define CONFIG_MII_INIT		1
 #define FEC_ENET
 #endif /* CONFIG_ETHER_ON_FEC || CONFIG_ETHER_ON_FEC2 */