staging: brcm80211: smac: fix for 64 bit systems

A bug was introduced by the following commit (Sep 13):

    staging: brcm80211: use endian annotated structures in brcmsmac

Result was that 64 bits systems will not be able to acquire an IP address.
Also the rmmod crashed. This has been fixed and retested on a Sparc64.

Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Alwin Beukers <alwin@broadcom.com>
Reviewed-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>