Add migration from FFULM to FFMUC #563

Job	Run time
generate_target_matrix	3s
build_firmware (ar71xx-generic)	55m 4s
build_firmware (ar71xx-mikrotik)	52m 36s
build_firmware (ar71xx-nand)	51m 22s
build_firmware (ar71xx-tiny)	33m 31s
build_firmware (ath79-generic)	51m 26s
build_firmware (brcm2708-bcm2708)	49m 45s
build_firmware (brcm2708-bcm2709)	49m 44s
build_firmware (brcm2708-bcm2710)	50m 17s
build_firmware (ipq40xx-generic)	53m 54s
build_firmware (ipq806x-generic)	51m 22s
build_firmware (lantiq-xrx200)	53m 56s
build_firmware (lantiq-xway)	56m 35s
build_firmware (mpc85xx-generic)	52m 9s
build_firmware (mpc85xx-p1020)	51m 22s
build_firmware (mvebu-cortexa9)	51m 2s
build_firmware (ramips-mt7620)	54m 37s
build_firmware (ramips-mt7621)	57m 56s
build_firmware (ramips-mt76x8)	55m 33s
build_firmware (ramips-rt305x)	34m 7s
build_firmware (sunxi-cortexa7)	51m 20s
build_firmware (x86-64)	59m 7s
build_firmware (x86-generic)	54m 37s
build_firmware (x86-geode)	57m 46s
build_firmware (x86-legacy)	55m 25s
create_release	0s
	20h 44m 36s

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