[Merge] ~ikapelyukhin/livecd-rootfs/+git/livecd-rootfs:master-split-disk-image into livecd-rootfs:ubuntu/master

[Ivan Kapelyukhin]

Ivan Kapelyukhin has proposed merging ~ikapelyukhin/livecd-rootfs/+git/livecd-rootfs:master-split-disk-image into livecd-rootfs:ubuntu/master.

Commit message:
perf(cpc): split disk-image-uefi out of disk-image series file

Due to how `disk-image` file is structured, it builds BIOS and UEFI
images at the same time. However, certain images (e.g., GCE images)
require only UEFI image to be built, BIOS image is being simply
discarded. This results in longer build times.

Splitting out `disk-image-uefi` would allow images to use it instead of
`disk-image` and thus avoid building unused BIOS images.

`disk-image` now depends on `disk-image-uefi` for backward
compatibility.

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)
Related bugs:
  Bug #1961760 in livecd-rootfs (Ubuntu): "`disk-image` not granular enough, often builds unused artifacts"
  https://bugs.launchpad.net/ubuntu/+source/livecd-rootfs/+bug/1961760

For more details, see:
https://code.launchpad.net/~ikapelyukhin/livecd-rootfs/+git/livecd-rootfs/+merge/415894
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~ikapelyukhin/livecd-rootfs/+git/livecd-rootfs:master-split-disk-image into livecd-rootfs:ubuntu/master.
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