dts: binding: ipm: Remove unused zephyr,ipm-console binding

There is no driver or other references to the zephyr,ipm-console
devicetree compatiable. So remove the binding.

Signed-off-by: Kumar Gala <galak@kernel.org>
diff --git a/dts/bindings/ipm/zephyr,ipm-console.yaml b/dts/bindings/ipm/zephyr,ipm-console.yaml
deleted file mode 100644
index 8159b08..0000000
--- a/dts/bindings/ipm/zephyr,ipm-console.yaml
+++ /dev/null
@@ -1,12 +0,0 @@
-# Copyright (c) 2020 Intel Corporation
-# SPDX-License-Identifier: Apache-2.0
-
-description: IPM console
-
-compatible: "zephyr,ipm-console"
-
-include: uart-device.yaml
-
-properties:
-  label:
-    required: true