Add new CANFD_FDF flag for the 'flags' field of 'canfd_frame'.

[fpagliughi]

Description

Adds a bitflag for the flags member of canfd_frame. This flag was added to the Linux kernel via can.h in v5.14

Sources

Checklist

• Relevant tests in libc-test/semver have been updated
• No placeholder or unstable values like *LAST or *MAX are
  included (see #3131)
• Tested locally (cd libc-test && cargo test --target mytarget);
  especially relevant for platforms that may not be checked in CI

[rustbot]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @tgross35 (or someone else) some time within the next two weeks.

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[tgross35]

Change LGTM, thanks! For future PRs, please provide a link to the relevant headers in the PR description, this is at https://github.com/torvalds/linux/blob/ccb98ccef0e543c2bd4ef1a72270461957f3d8d0/include/uapi/linux/can.h#L162.

@rustbot label +stable-nominated

[fpagliughi]

Ok. Thanks. Will do.