Add read/write APIs to testcase driver
Add read/write APIs to testcase driver

Add read/write APIs to testcase driver so that UTC apps can
open /dev/testcase to pass ioctls

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