add CreditUpdate to VsockDriveEvent enum

[727Hsj]

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[AsakuraMizu]

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[727Hsj]

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doc.md
ci-x86-unknown-none.md
ci-x86-unknown-linux-gnu.md
ci-riscv64gc.md
ci-aarch64.md

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[Copilot]

Pull request overview

This PR adds support for credit update events in the vsock driver by introducing a new CreditUpdate variant to the VsockDriverEvent enum. Credit updates are part of the vsock protocol flow control mechanism.

Changes:

• Added CreditUpdate(VsockConnId) variant to the VsockDriverEvent enum
• Implemented conversion handling for VsockEventType::CreditUpdate events
• Minor code formatting improvement for the Received event case

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
axdriver_vsock/src/lib.rs	Added CreditUpdate variant to the VsockDriverEvent enum with appropriate documentation
axdriver_virtio/src/socket.rs	Added conversion logic for CreditUpdate events and simplified formatting of Received event handling

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