dt-bindings: rcar-csi2: Convert bindings to json-schema

Convert Renesas R-Car MIPI CSI-2 receiver bindings documentation to
json-schema.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Rob Herring <robh@kernel.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index 111340d..f8d6e7e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10315,7 +10315,7 @@
 L:	linux-renesas-soc@vger.kernel.org
 T:	git git://linuxtv.org/media_tree.git
 S:	Supported
-F:	Documentation/devicetree/bindings/media/renesas,csi2.txt
+F:	Documentation/devicetree/bindings/media/renesas,csi2.yaml
 F:	Documentation/devicetree/bindings/media/renesas,vin.txt
 F:	drivers/media/platform/rcar-vin/