Update wpa_supplicant.sh

Is -z needed?

This is what happens when running carbon:

```
I/wpa_supplicant.sh( 1948): Executing wpa_supplicant for BRCM chips 

I/wpa_supplicant( 1949): /system/bin/wpa_supplicant: invalid option -- z

I/wpa_supplicant( 1949): wpa_supplicant v2.1-devel-4.4.4

I/wpa_supplicant( 1949): Copyright (c) 2003-2013, Jouni Malinen <j@w1.fi> and contributors

I/wpa_supplicant( 1949): This software may be distributed under the terms of the BSD license.

I/wpa_supplicant( 1949): See README for more details.

I/wpa_supplicant( 1949): This product includes software developed by the OpenSSL Project

I/wpa_supplicant( 1949): for use in the OpenSSL Toolkit (http://www.openssl.org/)

I/wpa_supplicant( 1949): usage:

I/wpa_supplicant( 1949):   wpa_supplicant [-BddhKLqqstuvW] [-P<pid file>] [-g<global ctrl>] \

I/wpa_supplicant( 1949):         [-G<group>] \

I/wpa_supplicant( 1949):         -i<ifname> -c<config file> [-C<ctrl>] [-D<driver>] [-p<driver_param>] \

I/wpa_supplicant( 1949):         [-b<br_ifname>] [-f<debug file>] [-e<entropy file>] \

I/wpa_supplicant( 1949):         [-o<override driver>] [-O<override ctrl>] \

I/wpa_supplicant( 1949):         [-N -i<ifname> -c<conf> [-C<ctrl>] [-D<driver>] \

I/wpa_supplicant( 1949):         [-p<driver_param>] [-b<br_ifname>] [-I<config file>] ...]

I/wpa_supplicant( 1949): drivers:

I/wpa_supplicant( 1949):   nl80211 = Linux nl80211/cfg80211

I/wpa_supplicant( 1949): options:

I/wpa_supplicant( 1949):   -b = optional bridge interface name

I/wpa_supplicant( 1949):   -B = run daemon in the background

I/wpa_supplicant( 1949):   -c = Configuration file

I/wpa_supplicant( 1949):   -C = ctrl_interface parameter (only used if -c is not)

I/wpa_supplicant( 1949):   -i = interface name

I/wpa_supplicant( 1949):   -I = additional configuration file

I/wpa_supplicant( 1949):   -d = increase debugging verbosity (-dd even more)

I/wpa_supplicant( 1949):   -D = driver name (can be multiple drivers: nl80211,wext)

I/wpa_supplicant( 1949):   -e = entropy file

I/wpa_supplicant( 1949):   -g = global ctrl_interface

I/wpa_supplicant( 1949):   -G = global ctrl_interface group

I/wpa_supplicant( 1949):   -K = include keys (passwords, etc.) in debug output

I/wpa_supplicant( 1949):   -t = include timestamp in debug messages

I/wpa_supplicant( 1949):   -h = show this help text

I/wpa_supplicant( 1949):   -L = show license (BSD)

I/wpa_supplicant( 1949):   -o = override driver parameter for new interfaces

I/wpa_supplicant( 1949):   -O = override ctrl_interface parameter for new interfaces

I/wpa_supplicant( 1949):   -p = driver parameters

I/wpa_supplicant( 1949):   -P = PID file

I/wpa_supplicant( 1949):   -q = decrease debugging verbosity (-qq even less)

I/wpa_supplicant( 1949):   -v = show version

I/wpa_supplicant( 1949):   -W = wait for a control interface monitor before starting

I/wpa_supplicant( 1949):   -N = start describing new interface

I/wpa_supplicant( 1949): example:

I/wpa_supplicant( 1949):   wpa_supplicant -Dnl80211 -iwlan0 -c/etc/wpa_supplicant.conf

E/WVMExtractor(  189): IsWidevineMedia not found in libwvm.so

E/WVMExtractor(  189): IsWidevineMedia not found in libwvm.so`
```