Pull in a slightly more recent version of open-amp with changes
to the build system to improve integration with Zephyr. The recent
changes let us embedded open-amp without having to use recursive
building.
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
Move open-amp to be in ext/lib/ipc/open-amp/open-amp. This allows us to
be Zephyr specific files and config like README (for import),
CMakeLists.txt file, Kconfig, etc in ext/lib/ipc/open-amp/ that don't
conflict with any files that might have the same name in
ext/lib/ipc/open-amp/open-amp.
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>