staging: brcm80211: remove macro WLBANDINITFN from brcmsmac

The macro WLBANDINITFN does nothing meaningful in the brcmsmac
driver and has been removed.

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