char: virtio: Select VIRTIO from VIRTIO_CONSOLE.

Make it possible to have virtio console built-in when
other virtio drivers are modular.

Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Reviewed-by: Amit Shah <amit@kernel.org>
Link: https://lore.kernel.org/r/20200831165850.26163-1-msuchanek@suse.de


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>