uboot-imx

nand: arasan: Select CONFIG_SYS_NAND_SELF_INIT

The Arasan NFC driver requires the self-init mode,
so it should select it.

Instead of having the config header define the macro,
it's cleaner to select the option at the Kconfig level.

Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>