staging: brcm80211: removed fullmac BRCMF_IOCTL_MAGIC support

staging: brcm80211: removed fullmac BRCMF_IOCTL_MAGIC support

Linux will never call brcmf_netdev_ioctl_entry() with the value
BRCMF_IOCTL_MAGIC in a user space buffer. Thus, unused code could be
removed.

Reported-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Roland Vossen <rvossen@broadcom.com>
Reviewed-by: Arend van Spriel <arend@broadcom.com>
Reviewed-by: Franky Lin <frankyl@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>