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/GEN860T.h b/include/configs/GEN860T.h
index 3eb3131..c8b5a6d 100644
--- a/include/configs/GEN860T.h
+++ b/include/configs/GEN860T.h
@@ -147,6 +147,7 @@
 #define CONFIG_FEC_ENET
 #define CFG_DISCOVER_PHY
 #define CONFIG_MII
+#define CONFIG_MII_INIT			1
 #define CONFIG_PHY_ADDR         		0
 
 /*