Add CONFIG_SYS_NAND_SELF_INIT to Kconfig for NAND DENALI driver

Add the CONFIG_SYS_NAND_SELF_INIT to the Kconfig to follow the changes from
mainline.

Signed-off-by: Lokanathan, Raaj <raaj.lokanathan@intel.com>
Signed-off-by: Jit Loon Lim <jit.loon.lim@intel.com>