staging: brcm80211: remove include file sbhndpio.h

All source files including sbhndpio.h were needing it only
because they needed d11.h and it had a dependency. The content
of sbhndpio.h has been merged in d11.h.

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