staging: brcm80211: removed unused code from bcmotp.c

Code cleanup. The supported chips all contain an 'IPX' controller, the
older 'hnd' OTP controller is not used.

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>