riscv: dts: spacemit: Disable ETH PHY sleep mode for OrangePi

On the SpacemiT K1 platform, the MAC can't read statistics when the PHY
clock stops. Disable Link Down Power Saving Mode for the YT8531C PHY on
OrangePi R2S and RV2 boards to avoid reading statistics timeout logs.

Signed-off-by: Chukun Pan <amadeus@jmu.edu.cn>
Reviewed-by: Yixun Lan <dlan@kernel.org>
Link: https://lore.kernel.org/r/20260120100001.1285624-2-amadeus@jmu.edu.cn
Signed-off-by: Yixun Lan <dlan@kernel.org>

Author: aiamadeus

arch/riscv/boot/dts/spacemit/k1-orangepi-r2s.dts

@@ -52,6 +52,7 @@
 
 		rgmii0: phy@1 {
 			reg = <0x1>;
+			motorcomm,auto-sleep-disabled;
 		};
 	};
 };
@@ -75,6 +76,7 @@
 
 		rgmii1: phy@1 {
 			reg = <0x1>;
+			motorcomm,auto-sleep-disabled;
 		};
 	};
 };

arch/riscv/boot/dts/spacemit/k1-orangepi-rv2.dts

@@ -54,6 +54,7 @@
 
 		rgmii0: phy@1 {
 			reg = <0x1>;
+			motorcomm,auto-sleep-disabled;
 		};
 	};
 };
@@ -77,6 +78,7 @@
 
 		rgmii1: phy@1 {
 			reg = <0x1>;
+			motorcomm,auto-sleep-disabled;
 		};
 	};
 };