[Merge] lp:~dannf/debian-installer/arm64-cleanup into lp:~ubuntu-core-dev/debian-installer/ubuntu

[dann frazier]

The proposal to merge lp:~dannf/debian-installer/arm64-cleanup into lp:~ubuntu-core-dev/debian-installer/ubuntu has been updated.

Description changed to:

This is a series of cleanups for the arm64 netboot build. Quick highlights:
 - Use mklibs
 - Get rid of "generic" in directory hiearchy
 - Rename "xgene" to "xgene-uboot"
 - Provide all available dtbs
 - Add a netboot tarball (will add grub/uboot-pxe confs later)
 - Generally more in-line w/ Debian

I strongly recommend reviewing each commit individually, esp. since files are getting moved around. I've tried to keep a commit per functional change.

For more details, see:
https://code.launchpad.net/~dannf/debian-installer/arm64-cleanup/+merge/249738
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of lp:~dannf/debian-installer/arm64-cleanup into lp:~ubuntu-core-dev/debian-installer/ubuntu.