powerpc/85xx: add support for FM2 DTSEC5

Unlike previous SOCs, the Freescale P5040 has a fifth DTSEC on the second
Fman, so add the Fman and SerDes macros for that DTSEC.

Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
diff --git a/include/fm_eth.h b/include/fm_eth.h
index c7c6882..05121ea 100644
--- a/include/fm_eth.h
+++ b/include/fm_eth.h
@@ -35,6 +35,7 @@
 	FM2_DTSEC2,
 	FM2_DTSEC3,
 	FM2_DTSEC4,
+	FM2_DTSEC5,
 	FM2_10GEC1,
 	NUM_FM_PORTS,
 };