powerpc/P5040DS: enable SATA support

The define CONFIG_FSL_SATA_V2 is missing, so SATA is not available
in U-boot.

Signed-off-by: Shaohui Xie <Shaohui.Xie@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
diff --git a/include/configs/P5040DS.h b/include/configs/P5040DS.h
index 371485f..e4a031a 100644
--- a/include/configs/P5040DS.h
+++ b/include/configs/P5040DS.h
@@ -17,6 +17,7 @@
 #define CONFIG_MMC
 #define CONFIG_NAND_FSL_ELBC
 #define CONFIG_PCIE3
+#define CONFIG_FSL_SATA_V2
 #define CONFIG_SYS_FSL_RAID_ENGINE
 
 #define CONFIG_ICS307_REFCLK_HZ		25000000  /* ICS307 ref clk freq */