fs/utc : Add utc for ftruncate, and fix wrong name of function
fs/utc : Add utc for ftruncate, and fix wrong name of function

Add 1 positive & 3 negative utc for ftruncate

sunghan-chang/TizenRT,jsdosa/TizenRT,junmin-kim/TizenRT,jsdosa/TizenRT,Samsung/TizenRT,jsdosa/TizenRT,sunghan-chang/TizenRT,jeongarmy/TizenRT,sunghan-chang/TizenRT,junmin-kim/TizenRT,jeongchanKim/TizenRT,an4967/TizenRT,sunghan-chang/TizenRT,jeongarmy/TizenRT,Samsung/TizenRT,pillip8282/TizenRT,pillip8282/TizenRT,an4967/TizenRT,jeongchanKim/TizenRT,an4967/TizenRT,jeongchanKim/TizenRT,jeongchanKim/TizenRT,pillip8282/TizenRT,pillip8282/TizenRT,junmin-kim/TizenRT,jeongarmy/TizenRT,jeongarmy/TizenRT,jeongchanKim/TizenRT,jeongarmy/TizenRT,jeongchanKim/TizenRT,sunghan-chang/TizenRT,junmin-kim/TizenRT,jeongchanKim/TizenRT,junmin-kim/TizenRT,jsdosa/TizenRT,pillip8282/TizenRT,pillip8282/TizenRT,junmin-kim/TizenRT,jsdosa/TizenRT,an4967/TizenRT,Samsung/TizenRT,Samsung/TizenRT,jeongarmy/TizenRT,Samsung/TizenRT,junmin-kim/TizenRT,Samsung/TizenRT,jsdosa/TizenRT,jsdosa/TizenRT,Samsung/TizenRT,sunghan-chang/TizenRT,an4967/TizenRT,sunghan-chang/TizenRT,an4967/TizenRT,pillip8282/TizenRT,an4967/TizenRT,jeongarmy/TizenRT