ipq806x: kernel crash log ramoops storage for R7800 and XR500

Define the kernel crash log storage ramoops/pstore feature
for R7800 and its sister XR500.

Reference to the ramoops admin guide in upstream Linux:
https://www.kernel.org/doc/html/v5.10/admin-guide/ramoops.html

Tested with R7800.

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>

target/linux/ipq806x/files/arch/arm/boot/dts/qcom-ipq8065-nighthawk.dtsi

@@ -13,6 +13,15 @@
 			reg = <0x5fe00000 0x200000>;
 			reusable;
 		};
+
+		ramoops@42100000 {
+			compatible = "ramoops";
+			reg = <0x42100000 0x40000>;
+			record-size = <0x4000>;
+			console-size = <0x4000>;
+			ftrace-size = <0x4000>;
+			pmsg-size = <0x4000>;
+		};
 	};
 
 	aliases {