libc: Enable LIBC_SCANSET by default in Kconfig
libc: Enable LIBC_SCANSET by default in Kconfig

Turn this feature on by default.
Instead, it will be disabled only in limited configurations

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