onenand: Remove ONENAND_BOOT option

The option ONENAND_BOOT is never set, so remove it. The option
SYS_ONENAND_BOOT was never migrated to Kconfig and any platforms which
supported that have long been removed from the code, so remove the
reference there as well.

Signed-off-by: Tom Rini <trini@konsulko.com>
2 files changed