framework/wifi_manager: fix menuconfig warnings
framework/wifi_manager: fix menuconfig warnings

The choice syntax of Kconfig does not support default value of config.
This commit fixs shown below:
../framework/src/wifi_manager/Kconfig:22:warning: defaults for choice values not supported
../framework/src/wifi_manager/Kconfig:29:warning: defaults for choice values not supported
../framework/src/wifi_manager/Kconfig:40:warning: defaults for choice values not supported
../framework/src/wifi_manager/Kconfig:45:warning: defaults for choice values not supported

jeongarmy/TizenRT,btheosam/TizenRT,lokeshbv/TizenRT,lokeshbv/TizenRT,sunghan-chang/TizenRT,jeongchanKim/TizenRT,chanijjani/TizenRT,lokeshbv/TizenRT,jeongarmy/TizenRT,HONGCHAEHEE/TizenRT,junmin-kim/TizenRT,davidfather/TizenRT,Samsung/TizenRT,an4967/TizenRT,sunghan-chang/TizenRT,chanijjani/TizenRT,Samsung/TizenRT,btheosam/TizenRT,jeongarmy/TizenRT,chanijjani/TizenRT,lokeshbv/TizenRT,an4967/TizenRT,chanijjani/TizenRT,sunghan-chang/TizenRT,davidfather/TizenRT,JeonginKim/TizenRT,chanijjani/TizenRT,sunghan-chang/TizenRT,btheosam/TizenRT,davidfather/TizenRT,jsdosa/TizenRT,pillip8282/TizenRT,HONGCHAEHEE/TizenRT,jeongchanKim/TizenRT,an4967/TizenRT,jsdosa/TizenRT,jeongchanKim/TizenRT,jsdosa/TizenRT,btheosam/TizenRT,junmin-kim/TizenRT,davidfather/TizenRT,davidfather/TizenRT,jeongarmy/TizenRT,btheosam/TizenRT,lokeshbv/TizenRT,jsdosa/TizenRT,HONGCHAEHEE/TizenRT,Samsung/TizenRT,Samsung/TizenRT,JeonginKim/TizenRT,an4967/TizenRT,an4967/TizenRT,chanijjani/TizenRT,chanijjani/TizenRT,jeongchanKim/TizenRT,JeonginKim/TizenRT,jsdosa/TizenRT,sunghan-chang/TizenRT,jsdosa/TizenRT,HONGCHAEHEE/TizenRT,sunghan-chang/TizenRT,lokeshbv/TizenRT,an4967/TizenRT,pillip8282/TizenRT,junmin-kim/TizenRT,jeongchanKim/TizenRT,Samsung/TizenRT,pillip8282/TizenRT,jsdosa/TizenRT,pillip8282/TizenRT,davidfather/TizenRT,btheosam/TizenRT,JeonginKim/TizenRT,HONGCHAEHEE/TizenRT,junmin-kim/TizenRT,HONGCHAEHEE/TizenRT,junmin-kim/TizenRT,jeongarmy/TizenRT,junmin-kim/TizenRT,pillip8282/TizenRT,Samsung/TizenRT,JeonginKim/TizenRT,jeongchanKim/TizenRT,davidfather/TizenRT,an4967/TizenRT,JeonginKim/TizenRT,Samsung/TizenRT,sunghan-chang/TizenRT,jeongarmy/TizenRT,jeongchanKim/TizenRT,pillip8282/TizenRT,jeongarmy/TizenRT,pillip8282/TizenRT,junmin-kim/TizenRT