arm64: dts: rockchip: Add DFI to rk356x

The DFI unit can be used to measure DRAM utilization using perf. Add the
node to the device tree.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Link: https://lore.kernel.org/r/20231018061714.3553817-26-s.hauer@pengutronix.de
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Author: saschahauer

arch/arm64/boot/dts/rockchip/rk356x.dtsi

@@ -959,6 +959,13 @@
 		reg = <0x0 0xfe1a8100 0x0 0x20>;
 	};
 
+	dfi: dfi@fe230000 {
+		compatible = "rockchip,rk3568-dfi";
+		reg = <0x00 0xfe230000 0x00 0x400>;
+		interrupts = <GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>;
+		rockchip,pmu = <&pmugrf>;
+	};
+
 	pcie2x1: pcie@fe260000 {
 		compatible = "rockchip,rk3568-pcie";
 		reg = <0x3 0xc0000000 0x0 0x00400000>,