arm64: dts: rockchip: fix pcie-refclk frequency on rk3588 tiger

The clock-generator of course only produces a 100MHz clock rate,
not 1GHz.

Signed-off-by: Heiko Stuebner <heiko.stuebner@cherry.de>
Reviewed-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Link: https://lore.kernel.org/r/20240423114635.2637310-1-heiko@sntech.de
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

[ upstream commit: 0eb2a93518fb4728bd1d55fcd3b57fce4797ef1d ]

(cherry picked from commit b574cbafae976cf508692088944e45c9764c0048)
diff --git a/dts/upstream/src/arm64/rockchip/rk3588-tiger.dtsi b/dts/upstream/src/arm64/rockchip/rk3588-tiger.dtsi
index 29f8e53..a856572 100644
--- a/dts/upstream/src/arm64/rockchip/rk3588-tiger.dtsi
+++ b/dts/upstream/src/arm64/rockchip/rk3588-tiger.dtsi
@@ -46,7 +46,7 @@
 	pcie_refclk_gen: pcie-refclk-gen-clock {
 		compatible = "fixed-clock";
 		#clock-cells = <0>;
-		clock-frequency = <1000000000>;
+		clock-frequency = <100000000>;
 	};
 
 	pcie_refclk: pcie-refclk-clock {