Add guide documenting updates from upstream sources

Document the process for updating packages where we pull from an upstream (non-Debian) source, such as we do for the LTS v.5.4 kernel.

Signed-off-by: Martyn Welch martyn.welch@collabora.com

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This has quite a bit of kernel-specific stuff that may confuse people, but we can address that later.

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mentioned in merge request !45 (merged)

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