staging: brcm80211: removed wlioctl.h and dhdioctl.h

Code cleanup. These header files were emptied by the previous patch.

Signed-off-by: Roland Vossen <rvossen@broadcom.com>
Reviewed-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>