feat(uvc): add NV12 format parsing

[TDA-2030]

Description

This PR adds NV12 format support to the USB Host UVC descriptor parser.

Changes:

• Add UVC_VS_FORMAT_NV12 to the public stream format enum.
• Parse uncompressed UVC format descriptors with NV12 GUID.
• Treat NV12 as an uncompressed frame format when populating frame info.
• Fix unsupported format handling by checking the parser result as int before casting to enum, preventing -1 from leaking into
  frame info.

Related

Testing

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Checklist

Before submitting a Pull Request, please ensure the following:

• 🚨 This PR does not introduce breaking changes.
• All CI checks (GH Actions) pass.
• Documentation is updated as needed.
• Tests are updated or added as necessary.
• Code is well-commented, especially in complex areas.
• Git history is clean — commits are squashed to the minimum necessary.

[tore-espressif]

@TDA-2030 Thank you!

Do you have a USB descriptor with NV12 format so we could add it to our tests?

[TDA-2030]

@TDA-2030 Thank you!

Do you have a USB descriptor with NV12 format so we could add it to our tests?

Yes, Here it is.
cam-desc.txt