soc: nxp: rt: Add CSI video support

Add CSI node to generic nxp rt dtsi.
Add corresponding dts binding.
Add CSI capability for rt MCUs.

Signed-off-by: Loic Poulain <loic.poulain@linaro.org>

dts/bindings/video/nxp,imx-csi.yaml

@@ -0,0 +1,26 @@
+#
+# Copyright (c) 2019, Linaro Limited
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+title: NXP MCUX CSI module
+
+description: >
+    This binding gives a base representation of NXP MCUX CMOS Sensor Interface
+
+compatible: "nxp,imx-csi"
+
+include: base.yaml
+
+properties:
+    interrupts:
+      required: true
+
+    label:
+      required: true
+
+    sensor-label:
+      required: true
+      type: string
+      description: label of connected sensor device