staging: brcm80211: change prototype for wlc_antsel_attach

wlc_antsel_attach was called with four parameters but actually
three parameters were already provided in the first parameter.

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>