Fixup SGMII PHY ids in the device tree

The device tree's PHY addresses need to be fixed up if we're using the
SGMII Riser Card.

The 8572, 8536, and 8544 DS boards were modified to call this function.

Code idea taken from Liu Yu <yu.liu@freescale.com>

Signed-off-by: Andy Fleming <afleming@freescale.com>
diff --git a/board/freescale/mpc8536ds/mpc8536ds.c b/board/freescale/mpc8536ds/mpc8536ds.c
index eb80500..bddc78f 100644
--- a/board/freescale/mpc8536ds/mpc8536ds.c
+++ b/board/freescale/mpc8536ds/mpc8536ds.c
@@ -625,8 +625,10 @@
 		return 0;
 	}
 
+#ifdef CONFIG_FSL_SGMII_RISER
 	if ((sdrs2_io_sel == 4) || (sdrs2_io_sel == 6))
 		fsl_sgmii_riser_init(tsec_info, num);
+#endif
 
 	tsec_eth_init(bis, tsec_info, num);
 #endif
@@ -653,5 +655,8 @@
 #ifdef CONFIG_PCIE1
 	ft_fsl_pci_setup(blob, "pci3", &pcie3_hose);
 #endif
+#ifdef CONFIG_FSL_SGMII_RISER
+	fsl_sgmii_riser_fdt_fixup(blob);
+#endif
 }
 #endif