meta-qemu-xilinx: Add recipe to construct an SDK w/ qemu-xilinx only
meta-qemu-xilinx: Add recipe to construct an SDK w/ qemu-xilinx only

Based on the oe-core buildtools-tarball recipe, we need a simple recipe
that provides a Yocto Project built and self-contained qemu-xilinx version.
This can then be used by external tooling and share a common source with
regular SDK and eSDKs produced by Yocto Project and PetaLinux builds.

Signed-off-by: Mark Hatle <41765ab18fb75e64ff0efe27f2ebcdb2d6f7e44e@xilinx.com>

Xilinx/meta-petalinux,Xilinx/meta-petalinux,Xilinx/meta-petalinux,Xilinx/meta-petalinux,Xilinx/meta-petalinux,Xilinx/meta-petalinux