ddr: altera: Add DDR driver for Agilex5 series

Adding DDR driver support for Agilex5 series.

Signed-off-by: Tingting Meng <tingting.meng@altera.com>
diff --git a/arch/arm/dts/socfpga_agilex5.dtsi b/arch/arm/dts/socfpga_agilex5.dtsi
index 03b5504..788e44f 100644
--- a/arch/arm/dts/socfpga_agilex5.dtsi
+++ b/arch/arm/dts/socfpga_agilex5.dtsi
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier:     GPL-2.0
 /*
  * Copyright (C) 2024 Intel Corporation <www.intel.com>
+ * Copyright (C) 2025 Altera Corporation <www.altera.com>
  */
 
 /dts-v1/;
@@ -544,6 +545,13 @@
 			status = "disabled";
 		};
 
+		sdr: sdr@18000000 {
+			compatible = "intel,sdr-ctl-agilex5";
+			reg = <0x18000000 0x400000>;
+			resets = <&rst DDRSCH_RESET>;
+			bootph-all;
+		};
+
 		/* QSPI address not available yet */
 		qspi: spi@108d2000 {
 			compatible = "cdns,qspi-nor";