[Merge] ~philroche/livecd-rootfs/+git/livecd-rootfs:bugfix/ubuntu-cpc-LP-2037074-flashkernel into livecd-rootfs:ubuntu/master

[Steve Langasek]

Review: Needs Fixing

flash-kernel in full cloud images is also wrong.  This code should be fixed to only install flash-kernel for device targets where it's needed.
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https://code.launchpad.net/~philroche/livecd-rootfs/+git/livecd-rootfs/+merge/451893
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