arm64: dts: apple: t8103: Add missing ps_pmp dependency to ps_gfx

AGX' ASC crashes shortly after ps_pmp is powered down due to dcp
runtime PM suspend.

Signed-off-by: Janne Grunau <j@jannau.net>

Author: jannau

arch/arm64/boot/dts/apple/t8103-pmgr.dtsi

@@ -733,6 +733,7 @@
 		#power-domain-cells = <0>;
 		#reset-cells = <0>;
 		label = "gfx";
+		power-domains = <&ps_pmp>;
 	};
 
 	ps_dcs4: power-controller@320 {