Add device-tree files for Xen support, Earlier all these files
were in meta-petalinux layer, Hence move these files to this layer
so that users can build Xen without including meta-petalinux.
Signed-off-by: Sandeep Gundlupet Raju <sandeep.gundlupet-raju@amd.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
