fsi: Make FSI a menuconfig to ease disabling it all

No need to get into the submenu to disable all FSI-related config entries

Signed-off-by: Vincent Legoll <vincent.legoll@gmail.com>
Acked-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>