dt-bindings: can: st,stm32-bxcan: fix st,gcan property type

The SRAM memory shared pointed to by the st,gcan property is unique, so
we don't need an array of phandles.

Fixes: e43250c ("dt-bindings: net: can: add STM32 bxcan DT bindings")
Signed-off-by: Dario Binacchi <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Marc Kleine-Budde <[email protected]>

Author: passgat

Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml

@@ -63,7 +63,7 @@ properties:
     maxItems: 1
 
   st,gcan:
-    $ref: /schemas/types.yaml#/definitions/phandle-array
+    $ref: /schemas/types.yaml#/definitions/phandle
     description:
       The phandle to the gcan node which allows to access the 512-bytes
       SRAM memory shared by the two bxCAN cells (CAN1 primary and CAN2