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Fix ATxmega fuses memory sizes #521

Job	Run time
linux-x86_64-autotools	1m 6s
linux-x86_64	1m 30s
linux (i386, i686, i686-linux-gnu, i386-linux-gnu)	1m 18s
linux (armhf, armhf, arm-linux-gnueabihf, arm-linux-gnueabihf)	1m 17s
macos-x86_64	53s
macos-x86_64-autotools	50s
linux (arm64, aarch64, aarch64-linux-gnu, aarch64-linux-gnu)	1m 22s
mingw (mingw64, x86_64)	3m 50s
msvc (x86, Win32)	2m 26s
msvc (x64, x64)	2m 10s
mingw (ucrt64, ucrt-x86_64)	4m 7s
msvc (arm64, ARM64)	2m 9s
mingw (clang64, clang-x86_64)	3m 6s
	26m 4s

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