Revert "testcase/filesystem: Fix fs readdir() tc failure"
Revert "testcase/filesystem: Fix fs readdir() tc failure"

This reverts commit 025cd752928a44adb72ad093ce0c65a7e1bfd6e2.

tc_vfs_seekdir() is failing after this commit.
readdir() returns NULL and doesn't modify errno.
But in TizenRT, this case is not yet supported and returns valid pointer.

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