dt-bindings: i2c: atmel,at91sam: correct path to i2c-controller schema

The referenced i2c-controller.yaml schema is provided by dtschema
package (outside of Linux kernel), so use full path to reference it.

Cc: stable@vger.kernel.org
Fixes: 7ea75dd386be ("dt-bindings: i2c: convert i2c-at91 to json-schema")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
diff --git a/Documentation/devicetree/bindings/i2c/atmel,at91sam-i2c.yaml b/Documentation/devicetree/bindings/i2c/atmel,at91sam-i2c.yaml
index b1c13ba..b2d19cf 100644
--- a/Documentation/devicetree/bindings/i2c/atmel,at91sam-i2c.yaml
+++ b/Documentation/devicetree/bindings/i2c/atmel,at91sam-i2c.yaml
@@ -77,7 +77,7 @@
   - clocks
 
 allOf:
-  - $ref: i2c-controller.yaml
+  - $ref: /schemas/i2c/i2c-controller.yaml#
   - if:
       properties:
         compatible: