imx8m{m,n}-venice-gw7902: add support for GPY111 phy

The TI DP83867 phy has been replaced with the MaxLinear GPY111 phy
due to part availability. Add support for it:
 - increase post-reset time to 300ms per datasheet
 - add tx-delay/rx-delay config

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
diff --git a/arch/arm/dts/imx8mn-venice-gw7902.dts b/arch/arm/dts/imx8mn-venice-gw7902.dts
index 29897c1..d026d96 100644
--- a/arch/arm/dts/imx8mn-venice-gw7902.dts
+++ b/arch/arm/dts/imx8mn-venice-gw7902.dts
@@ -242,10 +242,14 @@
 		ethphy0: ethernet-phy@0 {
 			compatible = "ethernet-phy-ieee802.3-c22";
 			reg = <0>;
+			/* TI DP83867 props */
 			ti,rx-internal-delay = <DP83867_RGMIIDCTL_2_00_NS>;
 			ti,tx-internal-delay = <DP83867_RGMIIDCTL_2_00_NS>;
 			tx-fifo-depth = <DP83867_PHYCR_FIFO_DEPTH_4_B_NIB>;
 			rx-fifo-depth = <DP83867_PHYCR_FIFO_DEPTH_4_B_NIB>;
+			/* GPY111 props */
+			rx-internal-delay-ps = <2000>;
+			tx-internal-delay-ps = <2500>;
 		};
 	};
 };