arm: dts: k3-am64-ddr: Add ss_cfg reg entry

Add 'ss_cfg' memory region for memorycontroller node which is required
to enable ECC.

Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
diff --git a/arch/arm/dts/k3-am64-ddr.dtsi b/arch/arm/dts/k3-am64-ddr.dtsi
index 026a547..8324b38 100644
--- a/arch/arm/dts/k3-am64-ddr.dtsi
+++ b/arch/arm/dts/k3-am64-ddr.dtsi
@@ -7,8 +7,9 @@
 	memorycontroller: memorycontroller@f300000 {
 		compatible = "ti,am64-ddrss";
 		reg = <0x00 0x0f308000 0x00 0x4000>,
-		      <0x00 0x43014000 0x00 0x100>;
-		reg-names = "cfg", "ctrl_mmr_lp4";
+		      <0x00 0x43014000 0x00 0x100>,
+		      <0x00 0x0f300000 0x00 0x200>;
+		reg-names = "cfg", "ctrl_mmr_lp4", "ss_cfg";
 		power-domains = <&k3_pds 138 TI_SCI_PD_SHARED>,
 			<&k3_pds 55 TI_SCI_PD_SHARED>;
 		clocks = <&k3_clks 138 0>, <&k3_clks 16 4>;