Upstream UEFI-defined constants to r-efi

[kat-perez]

Description

Several UEFI specification-defined constants are currently defined locally in patina crates rather than being sourced from r-efi. These should be upstreamed to r-efi so they are available to the broader UEFI Rust ecosystem.

From PR #1447 review:

"for these various UEFI spec defined things, we should be taking them to r-efi as well. Hosting them here until they are merged there is fine."

Constants to upstream

The following constants are defined in patina but belong in r-efi:

Boot Manager (patina_boot::helpers)

• LOAD_OPTION_ACTIVE (0x00000001) — EFI_LOAD_OPTION Attributes (UEFI Spec Section 3.1.3)
• BOOT_ORDER_VARIABLE_NAME — BootOrder null-terminated UTF-16 variable name
• Boot#### variable name format

Other areas (audit needed)

• EFI_GLOBAL_VARIABLE GUID (may already be in r-efi)
• EVENT_GROUP_END_OF_DXE GUID
• EVENT_GROUP_READY_TO_BOOT GUID
• SMBIOS-related constants in patina_smbios
• Any other UEFI spec-defined values used across patina crates

Action Items

1. Audit patina crates for locally-defined UEFI spec constants
2. Check which ones already exist in r-efi
3. Submit PRs to r-efi/r-efi for missing constants
4. Once merged and released, update patina to use r-efi definitions

References

• r-efi repository
• UEFI Specification 2.11
• PR [feature/patina-boot] patina_boot: Add discover_boot_options helper #1447 review comment from @os-d