board: gateworks: gw_ventana: add support for GPY111 PHY

The MaxLinear GPY111 PHY is being used on some boards due to part
availability. Add support for this PHY which requires a longer reset
post-delay and RGMII delay configuration.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
diff --git a/arch/arm/dts/imx6qdl-gw5913.dtsi b/arch/arm/dts/imx6qdl-gw5913.dtsi
index c2c1c2b..44d347f 100644
--- a/arch/arm/dts/imx6qdl-gw5913.dtsi
+++ b/arch/arm/dts/imx6qdl-gw5913.dtsi
@@ -123,7 +123,7 @@
 	phy-mode = "rgmii-id";
 	phy-reset-gpios = <&gpio1 30 GPIO_ACTIVE_LOW>;
 	phy-reset-duration = <10>;
-	phy-reset-post-delay = <100>;
+	phy-reset-post-delay = <300>;
 	status = "okay";
 };