command: Fixed platform_cmd_list extern declaration #671

Job	Run time
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, 96b_carbon)	32s
build-macos (macos-12)	33s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, bluepill)	25s
build-linux (ubuntu-22.04, jammy, clang-13)	34s
build-macos (macos-13)	49s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, ctxlink)	34s
build-linux (ubuntu-22.04, jammy, clang-18)	46s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, f072)	32s
build-linux (ubuntu-22.04, jammy, gcc-11)	32s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, f3)	32s
build-mingw (windows-2022, ucrt64)	2m 6s
build-linux (ubuntu-22.04, jammy, gcc-13)	1m 0s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, f4discovery)	23s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, hydrabus)	32s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, launchpad-icdi)	33s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, native)	32s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, stlink)	24s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, stlinkv3)	35s
build-firmware (ubuntu-22.04, jammy, 12.2.Rel1, swlink)	34s
package-firmware	3s
	12m 31s

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