iotjs_startup/Kconfig: Remove unncessary select option and Move ENABLE_IOTJS option for all
iotjs_startup/Kconfig: Remove unncessary select option and Move ENABLE_IOTJS option for all

1. ROMFS is not needed for EXAMPLES_IOTJS_STARTUP_JS_FILE. Because EXAMPLES_IOTJS_STARTUP_JS_FILE can be run without ROMFS.
2. Move select ENABLE_IOTJS to EXAMPLES_IOTJS_STARTUP. All other configs need this configuration.

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