main/linux-lts: enable EFI_ZBOOT on aarch64
Create the bootable image as an EFI application that carries the actual kernel image in compressed form, and decompresses it into memory before executing it via LoadImage/StartImage EFI boot service calls.
Related to 3094b7e1 (linux-edge) and !51348 (closed) (backport to v3.18).
Edited by Jakub Jirutka