buildroot

configs: warpboard: Select wireless related packages

Let the wireless packages be selected by default to make the
usage of Wifi a bit simpler.

Suggested-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>