This adds basic rfkill support for enabling the wireless card on certain
laptops, and changes miscellaneous other details that may help in obscure
cases.

Also change the error handling to not report CRC errors, which due to the
basic facts of wireless may happen even more frequently than valid packets.

Signed-off-by: Marty Connor <mdc@etherboot.org>

Signed-off-by: Michael Brown <mcb30@etherboot.org>