powerpc/85xx: add support for the Freescale P5040DS Superhydra reference board

The P5040DS reference board (a.k.a "Superhydra") is an enhanced version of
P3041DS/P5020DS ("Hydra") reference board.

Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Shaohui Xie <Shaohui.Xie@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
diff --git a/boards.cfg b/boards.cfg
index 7ae663c..1f49b48 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -848,6 +848,7 @@
 P5020DS_SECURE_BOOT          powerpc     mpc85xx     corenet_ds          freescale      -           P5020DS:SECURE_BOOT
 P5020DS_SPIFLASH	     powerpc     mpc85xx     corenet_ds          freescale      -           P5020DS:RAMBOOT_PBL,SPIFLASH,SYS_TEXT_BASE=0xFFF80000
 P5020DS_SRIO_PCIE_BOOT          powerpc     mpc85xx     corenet_ds          freescale      -           P5020DS:SRIO_PCIE_BOOT_SLAVE,SYS_TEXT_BASE=0xFFF80000
+P5040DS                      powerpc     mpc85xx     corenet_ds          freescale
 BSC9131RDB_SPIFLASH          powerpc     mpc85xx     bsc9131rdb          freescale      -           BSC9131RDB:BSC9131RDB,SPIFLASH
 stxgp3                       powerpc     mpc85xx     stxgp3              stx
 stxssa                       powerpc     mpc85xx     stxssa              stx            -           stxssa