dts: mt7988a: Add built-in ethernet phy firmware node

Add built-in ethernet phy firmware node in mt7988a.dtsi.

Signed-off-by: Sky Huang <skylake.huang@mediatek.com>

Author: onlyfly34

arch/arm64/boot/dts/mediatek/mt7988a.dtsi

@@ -460,6 +460,12 @@
 			nvmem-cell-names = "lvts-calib-data-1";
 		};
 
+		phyfw: phy-firmware@f000000 {
+			compatible = "mediatek,2p5gphy-fw";
+			reg = <0 0x0f100000 0 0x20000>,
+			      <0 0x0f0f0018 0 0x20>;
+		};
+
 		ssusb0: usb@11190000 {
 			compatible = "mediatek,mt7988-xhci", "mediatek,mtk-xhci";
 			reg = <0 0x11190000 0 0x2e00>,