Libmetal v2020.01 Release

Libmetal 2020.01 Release Notes

This is the 2020.01 release of OpenAMP. It includes the OpenAMP
and libmetal libraries. With this release, we welcome a new maintainer,
Arnaud Pouliquen, some new features, and support for new processors
and a new OS.

New Features:

Memory Translation Services

Added ability to translate from physical address to I/O region offset

New Processor Support

* CEVA
* RISC-V
* C-Sky
* X86

Added suport for NuttX OS.

Other changes

* update IRQ implementation
* update maintainers
* bug fixes