arm: dts: rockchip: rk3399: nanopi-r4s: Provide smbios sysinfo

Provide human-readable manufacturer and product names for the
FriendlyELEC NanoPi R4S.

Enable CONFIG_SYSINFO and CONFIG_SYSINFO_SMBIOS by default.

Signed-off-by: Christian Kohlschütter <christian@kohlschutter.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/dts/rk3399-nanopi-r4s-u-boot.dtsi b/arch/arm/dts/rk3399-nanopi-r4s-u-boot.dtsi
index cd16425..69800cc 100644
--- a/arch/arm/dts/rk3399-nanopi-r4s-u-boot.dtsi
+++ b/arch/arm/dts/rk3399-nanopi-r4s-u-boot.dtsi
@@ -14,3 +14,25 @@
 
 #include "rk3399-nanopi4-u-boot.dtsi"
 #include "rk3399-sdram-lpddr4-100.dtsi"
+
+/ {
+	smbios {
+		compatible = "u-boot,sysinfo-smbios";
+
+		smbios {
+			system {
+				manufacturer = "FriendlyELEC";
+				product = "NanoPi R4S";
+			};
+
+			baseboard {
+				manufacturer = "FriendlyELEC";
+				product = "NanoPi R4S";
+			};
+
+			chassis {
+				manufacturer = "FriendlyELEC";
+			};
+		};
+	};
+};