Detect SMBIOS3 in loader.efi

[dan.kotowski_a9development.com]

Summary

At the end of loader.efi main we scan the EFI system table entries for one beginning with an SMBIOS GUID, but not for SMBIOS3. This should solve problems where dmidecode cannot find the SMBIOS on Arm-based systems with SMBIOS3.

Test Plan

Tested on SolidRun Honeycomb/LX2160aCex

[manu]

Thanks, same thing was done in https://reviews.freebsd.org/D28737 it seems.

[dan.kotowski_a9development.com]

You are correct - D28737 should accomplish the same thing and is already accepted. This can be rejected in favor of that.