network/wifi_manager: fix build issue on wifi_profile
network/wifi_manager: fix build issue on wifi_profile

if CONFIG_WIFI_PROFILE_SECURESTORAGE is disabled then it can't refer readlen
which is used only above config so it causes a build error.

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