Update kernel to 6.12.0-55.39.1.2.1
- [CIQ] NVR Conventions (Jonathan Maple)
- Adding CIQ secureboot certs, variable overrides and macro (Michael Young)
- Enable UKI signing (Jonathan Dieter)
- Ensure UKI is signed with the correct key (Michael Young)
- Ensure CIQ IMA keys work (Jonathan Dieter)
- Fix up SBAT and ensure that UKI addons are signed with UKI key (Jonathan Dieter)