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>

include/fm_eth.h

@@ -35,6 +35,7 @@ enum fm_port {
 	FM2_DTSEC2,
 	FM2_DTSEC3,
 	FM2_DTSEC4,
+	FM2_DTSEC5,
 	FM2_10GEC1,
 	NUM_FM_PORTS,
 };