autoboot: fix typos of CONFIG_AUTOBOOT_USE_MENUKEY

Replace typo CONFIG_USE_AUTOBOOT_MENUKEY with
CONFIG_AUTOBOOT_USE_MENUKEY as when they were introduced initially there
was some mismatch in which name was used where.

Fixes: 8fc31e23 ("autoboot: Rename CONFIG_MENUKEY to CONFIG_AUTOBOOT_MENUKEY")
Signed-off-by: Da Xue <da@libre.computer>