arm: sam9_l9260_defconfig: remove non-existing config option

CONFIG_MTD_UBI_BEB_RESERVE has been removed and now we use
CONFIG_MTD_UBI_BEB_LIMIT instead.
Signed-off-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

arch/arm/configs/sam9_l9260_defconfig

@@ -39,7 +39,6 @@ CONFIG_MTD_NAND=y
 CONFIG_MTD_NAND_ATMEL=y
 CONFIG_MTD_NAND_PLATFORM=y
 CONFIG_MTD_UBI=y
-CONFIG_MTD_UBI_BEB_RESERVE=3
 CONFIG_MTD_UBI_BEB_LIMIT=3
 CONFIG_MTD_UBI_GLUEBI=y
 CONFIG_BLK_DEV_LOOP=y