domains: remove legacy ffdon domains #398

Job	Run time
generate_target_matrix	4s
build_firmware (ath79-generic)	53m 56s
build_firmware (ath79-mikrotik)	53m 28s
build_firmware (ath79-nand)	53m 26s
build_firmware (bcm27xx-bcm2708)	53m 25s
build_firmware (bcm27xx-bcm2709)	53m 28s
build_firmware (bcm27xx-bcm2710)	53m 25s
build_firmware (bcm27xx-bcm2711)	53m 25s
build_firmware (ipq40xx-generic)	53m 23s
build_firmware (ipq40xx-mikrotik)	53m 25s
build_firmware (ipq806x-generic)	53m 26s
build_firmware (lantiq-xrx200)	53m 23s
build_firmware (lantiq-xway)	53m 25s
build_firmware (mediatek-mt7622)	53m 25s
build_firmware (mpc85xx-p1010)	53m 23s
build_firmware (mpc85xx-p1020)	53m 24s
build_firmware (mvebu-cortexa9)	53m 26s
build_firmware (ramips-mt7620)	53m 25s
build_firmware (ramips-mt7621)	53m 56s
build_firmware (ramips-mt76x8)	53m 24s
build_firmware (realtek-rtl838x)	53m 23s
build_firmware (rockchip-armv8)	53m 25s
build_firmware (sunxi-cortexa7)	53m 23s
build_firmware (x86-64)	53m 25s
build_firmware (x86-generic)	53m 24s
build_firmware (x86-geode)	53m 24s
build_firmware (x86-legacy)	53m 23s
create_release	1s
	23h 9m 50s

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