Find common location for machine specific partitioning related data

[ricardosalveti]

Follow up from #67 (comment), we should have a dedicated repository for the partitioning related data that is consumed by meta-qcom-hwe but not hosted by the layers.

This is so we can start sharing with other common distributions (e.g. debian) later on.

[lumag]

As a note, we have been using https://git.codelinaro.org/linaro/qcomlt/db-boot-tools to contain data for supported devkits. Consider using that repo and using merge requests to provide data for newer boards.

[ndechesne]

We are currently looking into that. In meta-qcom-hwe we've been using an intermediate file format (partition.conf) instead of the XML files. We are planning to have a standalone repo to host these files outside of meta-qcom-hwe. we probably want to host it on a qualcomm github repo. let me think about that.

[lumag]

We settled on using CLO repo as this allowed us to use build artifacts in rescue package generation. If you switch to any other location, please pull in all boards definitions from the repo I have pointed to.

What is the benefit of using non-structured, non-verifiable file format?

[ndechesne]

yes, the distribution of prebuilt binary/rescue package is important, I am aware. For the additional/alternate file format, I am not sure why it was created, and I will check. It does not seem very useful, especially since the tool that converts to XML is not doing much processing, I will investigate more on that.