kernel: revert accidentally removed copyright header #34105

1. 
   l0rinc commented at 3:07 pm on December 18, 2025: contributor

   Accidentally removed in #30595. The author mentioned it was likely a bad rebase.

   See: https://github.com/bitcoin/bitcoin/commit/7990463b1059ba5fc4ebe37fd1105a9e168ae20d?diff=split#diff-04e685224f1ac5bfd91d47d8d7528a2e44f94fab5535d4b6b5af79b5a13aeb93L1-L12

   Found while reviewing #34084 (comment)

2. kernel: revert accidentally removed copyright header

   See:
   https://github.com/bitcoin/bitcoin/commit/7990463b1059ba5fc4ebe37fd1105a9e168ae20d?diff=split#diff-04e685224f1ac5bfd91d47d8d7528a2e44f94fab5535d4b6b5af79b5a13aeb93L1-L12

   85314dc0bf
3. DrahtBot added the label Validation on Dec 18, 2025
4. 
   DrahtBot commented at 3:08 pm on December 18, 2025: contributor

   The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

   Code Coverage & Benchmarks

   For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/34105.

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5. 
   fanquake commented at 3:15 pm on December 18, 2025: member

   ACK 85314dc0bf871226c0e43446bb79f49630d15f4a
6. fanquake merged this on Dec 18, 2025
7. fanquake closed this on Dec 18, 2025

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8. l0rinc deleted the branch on Dec 18, 2025

Contributors
l0rinc DrahtBot fanquake

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