add gpio led uart

hc

2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

 kernel/Documentation/admin-guide/hw-vuln/index.rst
..
..
@@ -16,3 +16,5 @@
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    multihit.rst
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    special-register-buffer-data-sampling.rst
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    processor_mmio_stale_data.rst
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+   gather_data_sampling.rst
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+   srso