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

[Philip Roche]

Philip Roche has proposed merging ~philroche/livecd-rootfs/+git/livecd-rootfs:bugfix/ubuntu-cpc-LP-2037074-flashkernel-removal into livecd-rootfs:ubuntu/master.

Commit message:
fix: arm flash-kernel removal from ubuntu-cpc project cloud images (LP: #2037074)

With the migration from linux-kvm to linux-virtual/generic for the mantic minimal
images we can now start building arm64 minimal cloud images.

When building initial test images we noticed that the flash-kernel package was being
installed. This is not required for EFI images.

This commit removes the flash-kernel package from the cloud images arm installs

The only images built using the livecd-rootfs ubuntu-cpc project for arm64 and armhf
which are not cloud images (which therefore do not require flash-kernel) are the
raspi images. raspi does require flash-kernel. But the raspi images use the
`ubuntu-server-raspi` task to install the flash-kernel. As such this non raspi
flash-kernel package install can be completely removed.

It also means that initramfs-tools and dracut-install are installed as these are dependencies
of flash-kernel package.



Requested reviews:
  Canonical Foundations Team (canonical-foundations)
Related bugs:
  Bug #2037074 in livecd-rootfs (Ubuntu): "Mantic minimal cloud images (ubuntu-cpc project) arm64 flash-kernel removal "
  https://bugs.launchpad.net/ubuntu/+source/livecd-rootfs/+bug/2037074

For more details, see:
https://code.launchpad.net/~philroche/livecd-rootfs/+git/livecd-rootfs/+merge/452254
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