openamp-image-minimal: add qemuarm64
openamp-image-minimal: add qemuarm64

Added qemuarm64 (as stand in for genericarm46).
Add the modules we need to the image.

Make the xilinx stuff depend on Xilinx machine's

Signed-off-by: Bill Mills <4edebd20c782911670c3fe74a26bb172af064938@linaro.org>

OpenAMP/meta-openamp,OpenAMP/meta-openamp