[3.18] main/linux-lts: enable EFI_ZBOOT on aarch64

Closed Jakub Jirutka requested to merge jirutka/aports:v3.18/linux-lts-efi-zboot into 3.18-stable

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.

Backport of !51347 (closed)

Edited by Jakub Jirutka

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