85xx/p1_p2_rdb: not able to modify "$bootfile" environment variable

Because the variable was getting defined twice.

Signed-off-by: Poonam Aggrwal <poonam.aggrwal@freescale.com>
Acked-by: Andy Fleming <afleming@freescale.com>
diff --git a/include/configs/P1_P2_RDB.h b/include/configs/P1_P2_RDB.h
index a9b4004..125911f 100644
--- a/include/configs/P1_P2_RDB.h
+++ b/include/configs/P1_P2_RDB.h
@@ -568,7 +568,6 @@
 	"netdev=eth0\0"						\
 	"uboot=" MK_STR(CONFIG_UBOOTPATH) "\0"				\
 	"loadaddr=1000000\0"			\
-	"bootfile=uImage\0"	\
 	"tftpflash=tftpboot $loadaddr $uboot; "			\
 		"protect off " MK_STR(TEXT_BASE) " +$filesize; "	\
 		"erase " MK_STR(TEXT_BASE) " +$filesize; "		\