Remove the mutex use in wifi_linkdown_event_func
Remove the mutex use in wifi_linkdown_event_func

- Quix fix for hanging up during wifi mode change
- Remove mutex lock/unlock to prevent lock up

Samsung/TizenRT,btheosam/TizenRT,HONGCHAEHEE/TizenRT,btheosam/TizenRT,btheosam/TizenRT,heejin-kim/TizenRT,Parkjihooni6186/TizenRT,pillip8282/TizenRT,sunghan-chang/TizenRT,jeongchanKim/TizenRT,yashwanth686007/TizenRTOS,jeongarmy/TizenRT,lokeshbv/TizenRT,sunghan-chang/TizenRT,sunghan-chang/TizenRT,pillip8282/TizenRT,heejin-kim/TizenRT,heejin-kim/TizenRT,Parkjihooni6186/TizenRT,junmin-kim/TizenRT,davidfather/TizenRT,Parkjihooni6186/TizenRT,chanijjani/TizenRT,davidfather/TizenRT,jeongchanKim/TizenRT,an4967/TizenRT,jeongchanKim/TizenRT,junmin-kim/TizenRT,pillip8282/TizenRT,HONGCHAEHEE/TizenRT,JeongJunSik/TizenRT,pillip8282/TizenRT,JeonginKim/TizenRT,jeongarmy/TizenRT,chanijjani/TizenRT,JeongJunSik/TizenRT,jsdosa/TizenRT,an4967/TizenRT,lokeshbv/TizenRT,Samsung/TizenRT,jeongarmy/TizenRT,Samsung/TizenRT,davidfather/TizenRT,chanijjani/TizenRT,lokeshbv/TizenRT,yashwanth686007/TizenRTOS,shivgarg/TizenRT,yashwanth686007/TizenRTOS,lokeshbv/TizenRT,junmin-kim/TizenRT,junmin-kim/TizenRT,davidfather/TizenRT,JeonginKim/TizenRT,junmin-kim/TizenRT,JeongJunSik/TizenRT,jeongchanKim/TizenRT,davidfather/TizenRT,heejin-kim/TizenRT,pillip8282/TizenRT,jeongchanKim/TizenRT,shivgarg/TizenRT,jsdosa/TizenRT,chanijjani/TizenRT,Samsung/TizenRT,lokeshbv/TizenRT,junmin-kim/TizenRT,sunghan-chang/TizenRT,jsdosa/TizenRT,yashwanth686007/TizenRTOS,chanijjani/TizenRT,jsdosa/TizenRT,yashwanth686007/TizenRTOS,jeongarmy/TizenRT,HONGCHAEHEE/TizenRT,btheosam/TizenRT,Samsung/TizenRT,HONGCHAEHEE/TizenRT,shivgarg/TizenRT,davidfather/TizenRT,HONGCHAEHEE/TizenRT,pillip8282/TizenRT,yashwanth686007/TizenRTOS,lokeshbv/TizenRT,junmin-kim/TizenRT,shivgarg/TizenRT,HONGCHAEHEE/TizenRT,an4967/TizenRT,jeongchanKim/TizenRT,sunghan-chang/TizenRT,JeonginKim/TizenRT,jeongarmy/TizenRT,JeonginKim/TizenRT,sunghan-chang/TizenRT,JeongJunSik/TizenRT,Samsung/TizenRT,pillip8282/TizenRT,heejin-kim/TizenRT,shivgarg/TizenRT,jeongchanKim/TizenRT,btheosam/TizenRT,an4967/TizenRT,chanijjani/TizenRT,JeonginKim/TizenRT,davidfather/TizenRT,jsdosa/TizenRT,Samsung/TizenRT,jeongarmy/TizenRT,an4967/TizenRT,shivgarg/TizenRT,Parkjihooni6186/TizenRT,JeongJunSik/TizenRT,jeongarmy/TizenRT,an4967/TizenRT,JeongJunSik/TizenRT,heejin-kim/TizenRT,Parkjihooni6186/TizenRT,sunghan-chang/TizenRT,an4967/TizenRT,btheosam/TizenRT,Parkjihooni6186/TizenRT,JeonginKim/TizenRT,jsdosa/TizenRT,jsdosa/TizenRT,chanijjani/TizenRT