config option GENERIC_IO was removed but still selected by lib/kconfig
This patch finish the cleaning.

Fixes: 9de8da47 ("kconfig: kill off GENERIC_IO option")
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NCorentin Labbe <clabbe@baylibre.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>