powerpc/p1_p2_rdb_pc: Fix warnings for __iomem pointers

Add the __iomem address space marker for the tsec pointers
to struct tsec_mii_mng memory mapped register regions.
This solves the sparse warnings for mixig normal pointers with
__iomem pointers for tsec.

p1_p2_rdb_pc.c:373:24: warning: incorrect type in assignment (different
address spaces)
p1_p2_rdb_pc.c:373:24:    expected struct tsec_mii_mng [noderef]
<asn:2>*regs
p1_p2_rdb_pc.c:373:24:    got struct tsec_mii_mng *<noident>

Use TSEC_GET_MDIO_REGS_BASE() for the remaining mdio 'regs'
initializations to remove the __iomem warnings and for consistency.

Signed-off-by: Claudiu Manoil <claudiu.manoil@freescale.com>
Acked-by: York Sun <yorksun@freescale.com>

board/freescale/p1_p2_rdb_pc/p1_p2_rdb_pc.c

 /*
- * Copyright 2010-2011 Freescale Semiconductor, Inc.
+ * Copyright 2010-2011, 2013 Freescale Semiconductor, Inc.
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */
@@ -354,7 +354,7 @@ int board_eth_init(bd_t *bis)
 		puts("No address specified for VSC7385 microcode.\n");
 #endif
 
-	mdio_info.regs = (struct tsec_mii_mng *)CONFIG_SYS_MDIO_BASE_ADDR;
+	mdio_info.regs = TSEC_GET_MDIO_REGS_BASE(1);
 	mdio_info.name = DEFAULT_MII_NAME;
 
 	fsl_pq_mdio_init(bis, &mdio_info);