Implement skiboot versioning

We grab a version from git tags (or SKIBOOT_VERSION environment variable),
optionally tack on EXTRA_VERSION (if from git) as well as add things to the
git version number if we're ahead of the most recent tag or the tree is dirty.

Also fix-up makefiles so that we don't have to rebuild version.c every time
you run make.

fsp attn area needed updating as we can have >40 character version strings.

We also export the version string via device tree rather than just the gitid.

For buildroot builds, setting SKIBOOT_VERSION environment variable to the
tag you grab will do the correct thing.

Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

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