dt-bindings: arm: move sprd board file to vendor directory

We've created a vendor directory for sprd, so move the board bindings to
there.

Link: https://lore.kernel.org/r/20200110063755.19804-2-zhang.lyra@gmail.comSigned-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Olof Johansson <olof@lixom.net>

Documentation/devicetree/bindings/arm/sprd.yaml → Documentation/devicetree/bindings/arm/sprd/sprd.yaml

@@ -2,7 +2,7 @@
 # Copyright 2019 Unisoc Inc.
 %YAML 1.2
 ---
-$id: http://devicetree.org/schemas/arm/sprd.yaml#
+$id: http://devicetree.org/schemas/arm/sprd/sprd.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
 title: Unisoc platforms device tree bindings