dt-bindings: gnss: u-blox: add "reset-gpios" binding

The Renesas KingFisher board includes a U-Blox Neo-M8 chip. This chip
has a reset pin which is also wired on the board. Introduce a binding to
support this reset pin.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Johan Hovold <johan@kernel.org>

Documentation/devicetree/bindings/gnss/u-blox,neo-6m.yaml

@@ -28,6 +28,9 @@ properties:
       port or the USB host-controller port to which this device is attached,
       depending on the bus used. Required for the DDC, SPI or USB busses.
 
+  reset-gpios:
+    maxItems: 1
+
   vcc-supply:
     description: >
       Main voltage regulator
@@ -49,10 +52,13 @@ unevaluatedProperties: false
 
 examples:
   - |
+    #include <dt-bindings/gpio/gpio.h>
+
     serial {
         gnss {
             compatible = "u-blox,neo-8";
             v-bckp-supply = <&gnss_v_bckp_reg>;
             vcc-supply = <&gnss_vcc_reg>;
+            reset-gpios = <&gpio 1 GPIO_ACTIVE_LOW>;
         };
     };