docs/APIListToBePorted.md : Add reboot reason APIs
docs/APIListToBePorted.md : Add reboot reason APIs

reboot_reason_init, read, write, clear should be ported when porting new chip.

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