powerpc/p5040: enable NAND, SD, SPI boot support

Signed-off-by: Shaohui Xie <Shaohui.Xie@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>

boards.cfg

@@ -880,6 +880,9 @@ P5020DS_SECURE_BOOT          powerpc     mpc85xx     corenet_ds          freesca
 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
+P5040DS_NAND		     powerpc     mpc85xx     corenet_ds          freescale      -           P5040DS:RAMBOOT_PBL,NAND,SYS_TEXT_BASE=0xFFF80000
+P5040DS_SDCARD		     powerpc     mpc85xx     corenet_ds          freescale      -           P5040DS:RAMBOOT_PBL,SDCARD,SYS_TEXT_BASE=0xFFF80000
+P5040DS_SPIFLASH	     powerpc     mpc85xx     corenet_ds          freescale      -           P5040DS:RAMBOOT_PBL,SPIFLASH,SYS_TEXT_BASE=0xFFF80000
 BSC9131RDB_SPIFLASH          powerpc     mpc85xx     bsc9131rdb          freescale      -           BSC9131RDB:BSC9131RDB,SPIFLASH
 BSC9132QDS_NOR_DDRCLK100     powerpc     mpc85xx     bsc9132qds          freescale      -           BSC9132QDS:BSC9132QDS,SYS_CLK_100_DDR_100
 BSC9132QDS_NOR_DDRCLK133     powerpc     mpc85xx     bsc9132qds          freescale      -           BSC9132QDS:BSC9132QDS,SYS_CLK_100_DDR_133