samples: net: wifi: Add a cc3220sf_launchxl conf file
samples: net: wifi: Add a cc3220sf_launchxl conf file

This enables testing of the scan, connect, and disconnect
wifi_mgmt functions of the wifi shell module for
the cc3220sf_launchxl.

Signed-off-by: Gil Pitney <477da50908f0a7963c2c490cce0ff096d2cac162@linaro.org>

ldts/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,punitvara/zephyr,GiulianoFranchetto/zephyr,galak/zephyr,Vudentz/zephyr,kraj/zephyr,explora26/zephyr,kraj/zephyr,kraj/zephyr,galak/zephyr,GiulianoFranchetto/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,explora26/zephyr,ldts/zephyr,nashif/zephyr,Vudentz/zephyr,galak/zephyr,nashif/zephyr,Vudentz/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,GiulianoFranchetto/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,explora26/zephyr,punitvara/zephyr,nashif/zephyr,GiulianoFranchetto/zephyr,explora26/zephyr,punitvara/zephyr,kraj/zephyr,Vudentz/zephyr,finikorg/zephyr,ldts/zephyr,kraj/zephyr,zephyrproject-rtos/zephyr,punitvara/zephyr,ldts/zephyr,punitvara/zephyr,finikorg/zephyr,Vudentz/zephyr,explora26/zephyr,galak/zephyr,finikorg/zephyr