add tokiOS Xilinx layer

LICENSE

+BSD with Attribution License
+
+Copyright (c) 2015-2020 fortiss GmbH - Research Institute of the
+    Free State of Bavaria, Guerickestr. 25, 80805 Munich, Germany
+
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+modification, are permitted provided that the following conditions
+are met:
+
+1. Redistributions of source code must retain the above copyright
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+
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+   contributors may be used to endorse or promote products derived
+   from this software without specific prior written permission.
+
+4. Redistributions of any form whatsoever must retain the following
+   acknowledgment: 'This product includes software developed by the
+   fortiss GmbH -- Research Institute of the Free State of Bavaria,
+   Munich, Germany (https://www.fortiss.org/).'
+
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+SPDX-License-Identifier: BSD-3-Clause-Attribution

conf/layer.conf

+# We have a conf and classes directory, add to BBPATH
+BBPATH .= ":${LAYERDIR}"
+
+# We have recipes-* directories, add to BBFILES
+BBFILES += "${LAYERDIR}/recipes-*/*/*.bb \
+            ${LAYERDIR}/recipes-*/*/*.bbappend"
+
+BBFILE_COLLECTIONS += "toki-xilinx-layer"
+BBFILE_PATTERN_toki-xilinx-layer = "^${LAYERDIR}/"
+BBFILE_PRIORITY_toki-xiinx-layer = "6"
+LAYERVERSION_toki-xilinx-layer = "1"
+LAYERSERIES_COMPAT_toki-xilinx-layer = "sumo thud"
+LAYERDEPENDS_toki-xilinx-layer = "toki-layer xilinx"