[Task] Centralize SmbiosError to EFI Status conversion using From impl

[kat-perez]

Summary

Centralize the SmbiosError to efi::Status conversion in protocol.rs by using the existing From<SmbiosError> for EfiError impl and the EfiError → efi::Status conversion chain.

Background

Currently, protocol.rs has manual match statements converting SmbiosError variants to efi::Status in each FFI
function (add_ext, update_string_ext, remove_ext). This duplicates the conversion logic that already exists
in From<SmbiosError> for EfiError.

Proposed Change

1. Update From<SmbiosError> for EfiError in error.rs:

   • Map RecordTooSmall and StringPoolTooSmall to EfiError::BufferTooSmall (instead of InvalidParameter)

2. Simplify protocol.rs to use the conversion chain:

// Instead of manual match arms:
Err(SmbiosError::RecordTooSmall) => efi::Status::BUFFER_TOO_SMALL,
Err(SmbiosError::HandleNotFound) => efi::Status::NOT_FOUND,
// ...

// Use:
Err(e) => patina::error::EfiError::from(e).into()

Benefits

• Single source of truth for error mappings
• Reduces code duplication across FFI functions
• Easier to maintain and update error mappings

Related

Identified during PR #1147 review.