Using internal mbedtls lib for encrypted meters. Next up, find out how to modify config.h when using external lib.

lib/mbedtls/.github/pull_request_template.md

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+Notes:
+* Pull requests cannot be accepted until the PR follows the [contributing guidelines](../CONTRIBUTING.md). In particular, each commit must have at least one `Signed-off-by:` line from the committer to certify that the contribution is made under the terms of the [Developer Certificate of Origin](../dco.txt).
+* This is just a template, so feel free to use/remove the unnecessary things
+## Description
+A few sentences describing the overall goals of the pull request's commits.
+
+
+## Status
+**READY/IN DEVELOPMENT/HOLD**
+
+## Requires Backporting
+When there is a bug fix, it should be backported to all maintained and supported branches.
+Changes do not have to be backported if:
+- This PR is a new feature\enhancement
+- This PR contains changes in the API. If this is true, and there is a need for the fix to be backported, the fix should be handled differently in the legacy branch
+
+Yes | NO  
+Which branch?
+
+## Migrations
+If there is any API change, what's the incentive and logic for it.
+
+YES | NO
+
+## Additional comments
+Any additional information that could be of interest
+
+## Todos
+- [ ] Tests
+- [ ] Documentation
+- [ ] Changelog updated
+- [ ] Backported
+
+
+## Steps to test or reproduce
+Outline the steps to test or reproduce the PR here.