configs: icorem6: Enable Nand bcb command

This would be used for writing spl images along nand BCB
Signed-off-by: NShyam Saini <shyam.saini@amarulasolutions.com>

configs/imx6qdl_icore_mmc_defconfig

@@ -14,6 +14,7 @@ CONFIG_DEBUG_UART_BASE=0x021f0000
 CONFIG_DEBUG_UART_CLOCK=24000000
 CONFIG_SPL_LIBDISK_SUPPORT=y
 # CONFIG_CMD_BMODE is not set
+CONFIG_CMD_NANDBCB=y
 CONFIG_DEBUG_UART=y
 CONFIG_FIT=y
 CONFIG_FIT_SIGNATURE=y