Fix: AT32F43x cleanup #2820

Job	Run time
build-msvc (meson, windows-2022)	1m 26s
build-mingw (windows-2022, mingw64)	1m 50s
build-macos (macos-13, gcc@11)	1m 13s
build-mingw (windows-2022, ucrt64)	2m 1s
build-linux (jammy, 96b_carbon)	1m 5s
build-macos (macos-13, gcc@12)	59s
build-mingw (windows-2022, clang64)	1m 49s
build-linux (jammy, blackpill-f401cc)	38s
build-macos (macos-13, gcc@13)	1m 21s
build-macos (macos-13)	32s
build-linux (jammy, blackpill-f401ce)	1m 5s
build-macos (macos-13, gcc@14)	1m 59s
build-macos (macos-14)	29s
build-linux (jammy, blackpill-f411ce)	58s
build-macos (macos-14, gcc@11)	43s
build-macos (macos-latest)	25s
size-diff	54s
build-linux (jammy, bluepill)	33s
build-macos (macos-14, gcc@12)	35s
build-linux (jammy, ctxlink)	1m 15s
build-macos (macos-14, gcc@13)	37s
build-macos (macos-14, gcc@14)	39s
build-linux (jammy, f072)	48s
build-linux (jammy, f3)	32s
build-linux (jammy, f4discovery)	31s
build-linux (jammy, hydrabus)	48s
build-linux (jammy, launchpad-icdi)	1m 2s
build-linux (jammy, native)	52s
build-linux (jammy, native-uncommon)	1m 2s
build-linux (jammy, native-st-clones)	34s
build-linux (jammy, native-riscv)	47s
build-linux (jammy, native-remote)	1m 2s
build-linux (jammy, stlink)	49s
build-linux (jammy, stlinkv3)	35s
build-linux (jammy, swlink)	31s
	32m 59s

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