dts: bindings: Add CPU device bindings for Cortex-R7.

This commit adds device bindings for Cortex-R7.

Signed-off-by: Julien Massot <julien.massot@iot.bzh>
diff --git a/dts/bindings/cpu/arm,cortex-r7.yaml b/dts/bindings/cpu/arm,cortex-r7.yaml
new file mode 100644
index 0000000..c7ecd06
--- /dev/null
+++ b/dts/bindings/cpu/arm,cortex-r7.yaml
@@ -0,0 +1,8 @@
+# Copyright (c) 2021 IoT.bzh
+# SPDX-License-Identifier: Apache-2.0
+
+description: ARM Cortex-R7 CPU
+
+compatible: "arm,cortex-r7"
+
+include: cpu.yaml