staging: brcm80211: Fix module parameter permissions

The third parameter of module_param is supposed to represent sysfs
file permissions. A value of "1" makes no sense.

I am changing it to "0" to align with the other module parameters in
this driver.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Cc: Henry Ptasinski <henryp@broadcom.com>
Cc: Brett Rudley <brudley@broadcom.com>
Cc: Roland Vossen <rvossen@broadcom.com>
Cc: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>