igc: set tx buffer type for SMD frames

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                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                        "drivers/net/ethernet/intel/igc/igc_tsn.c"
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{
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                    "vendor": "Linux",
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                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/net/ethernet/intel/igc/igc_tsn.c"
                    ],
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                            "version": "6.16",
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