[Openamp-rp] Release of OpenAMP 2021.04

This is to announce the release of version 2021.04 of the OpenAMP and libmetal libraries.

Release notes can be found at:

https://github.com/OpenAMP/libmetal/releases/tag/v2021.04.0

https://github.com/OpenAMP/open-amp/releases/tag/v2021.04.0

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