build/tools/amebad/bootloader/ : Hotfix multiple binaries download
build/tools/amebad/bootloader/ : Hotfix multiple binaries download

1. Support multiple binaries download in hotfix
2. Fix "board without secure boot efuse bit enabled + Secure image2" booting fail case.

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