dts: bindings: Rename espi.yaml to espi-controller.yaml

Renaming bindings to consistently be called foo-controller.yaml for
controllers and foo-device.yaml for devices (last one mostly makes sense
for devices on buses and the like).

I was thinking of having a plain foo.yaml be the controller as well, but

    !include interrupt.yaml

reads much worse than

    !include interrupt-controller.yaml

Another advantage of this approach is that no binding changes meaning
(which could be risky). It's just adding suffixes to filenames.

Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>

dts/bindings/espi/microchip,xec-espi.yaml

@@ -8,7 +8,7 @@ description: >
     This binding gives a base representation of ESPI controller for Microchip
 
 inherits:
-    !include espi.yaml
+    !include espi-controller.yaml
 
 properties:
     compatible: