powerpc/p2041rdb: add NAND and NAND boot support

New P2041RDB board will add a NAND chip, so add support for NAND and
NAND boot.

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 3cf75c3..1986da9 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -742,6 +742,7 @@
 P2020RDB_SDCARD              powerpc     mpc85xx     p1_p2_rdb           freescale      -           P1_P2_RDB:P2020RDB,SDCARD
 P2020RDB_SPIFLASH            powerpc     mpc85xx     p1_p2_rdb           freescale      -           P1_P2_RDB:P2020RDB,SPIFLASH
 P2041RDB                     powerpc     mpc85xx     p2041rdb            freescale
+P2041RDB_NAND	             powerpc     mpc85xx     p2041rdb            freescale      -           P2041RDB:RAMBOOT_PBL,NAND,SYS_TEXT_BASE=0xFFF80000
 P2041RDB_SDCARD              powerpc     mpc85xx     p2041rdb            freescale      -           P2041RDB:RAMBOOT_PBL,SDCARD,SYS_TEXT_BASE=0xFFF80000
 P2041RDB_SECURE_BOOT         powerpc     mpc85xx     p2041rdb            freescale      -           P2041RDB:SECURE_BOOT
 P2041RDB_SPIFLASH            powerpc     mpc85xx     p2041rdb            freescale      -           P2041RDB:RAMBOOT_PBL,SPIFLASH,SYS_TEXT_BASE=0xFFF80000