Rename default_efi_image and fallback_efi_image to default_uki and fallback_uki, and more
In an effort to spread the adoption of the "UKI" acronym for unified kernel images, we should make use of it where possible.
What should be changed is:
- mkinitcpio and preset variables
*_efi_image
→*_uki
- mkinitcpio option
--uefi
(and its docs, and related internal variables) →--uki
And probably something more.
The only variables/options should remain left working, but should not be documented anymore.
Edited by nl6720