Add migration from FFULM to FFMUC #577

Job	Run time
generate_target_matrix	3s
build_firmware (ar71xx-generic)	1h 0m 18s
build_firmware (ar71xx-mikrotik)	55m 0s
build_firmware (ar71xx-nand)	54m 18s
build_firmware (ar71xx-tiny)	38m 21s
build_firmware (ath79-generic)	54m 37s
build_firmware (brcm2708-bcm2708)	52m 22s
build_firmware (brcm2708-bcm2709)	52m 8s
build_firmware (brcm2708-bcm2710)	53m 15s
build_firmware (ipq40xx-generic)	55m 47s
build_firmware (ipq806x-generic)	55m 6s
build_firmware (lantiq-xrx200)	55m 56s
build_firmware (lantiq-xway)	53m 58s
build_firmware (mpc85xx-generic)	53m 0s
build_firmware (mpc85xx-p1020)	55m 40s
build_firmware (mvebu-cortexa9)	54m 23s
build_firmware (ramips-mt7620)	55m 32s
build_firmware (ramips-mt7621)	57m 6s
build_firmware (ramips-mt76x8)	54m 51s
build_firmware (ramips-rt305x)	35m 54s
build_firmware (sunxi-cortexa7)	54m 9s
build_firmware (x86-64)	1h 2m 17s
build_firmware (x86-generic)	59m 46s
build_firmware (x86-geode)	58m 46s
build_firmware (x86-legacy)	57m 2s
create_release	0s
	21h 39m 35s

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