arm64: dts: rockchip: enable gpu on rk3588-tiger

Enable the mali gpu node and add the som-specific supply-regulator.
Signed-off-by: Heiko Stuebner <heiko.stuebner@cherry.de>
Reviewed-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Link: https://lore.kernel.org/r/20240327112120.1181570-2-heiko@sntech.deSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3588-tiger.dtsi

@@ -139,6 +139,11 @@ &eth0_pins
 	snps,reset-delays-us = <0 10000 100000>;
 };
 
+&gpu {
+	mali-supply = <&vdd_gpu_s0>;
+	status = "okay";
+};
+
 &i2c1 {
 	pinctrl-0 = <&i2c1m0_xfer>;
 };