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/uc100.h b/include/configs/uc100.h
index c1c2e03..3c2de40 100644
--- a/include/configs/uc100.h
+++ b/include/configs/uc100.h
@@ -510,6 +510,7 @@
 #define	CONFIG_FEC_ENET		1	/* use FEC ethernet  */
 #define FEC_ENET
 #define CONFIG_MII
+#define CONFIG_MII_INIT		1
 #define CFG_DISCOVER_PHY	1
 
 #endif	/* __CONFIG_H */