arm64: zynqmp: PM: Specify power domains for DP related nodes

Currently DP power domain (pd_dp) is not attached to any of the DP nodes which is
causing genpd to trigger a power down request for DP domain, making all DP related
peripherals unusable. So assign power domains for all DP related nodes to enable
proper accounting of DP power domain usage.
Signed-off-by: NJyotheeswar Reddy <jyothee@xilinx.com>
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>

arch/arm/dts/zynqmp.dtsi

@@ -167,7 +167,6 @@
 		};
 
 		pd_dp: pd-dp {
-			/* fixme: what to attach to */
 			#power-domain-cells = <0x0>;
 			pd-id = <0x29>;
 		};
@@ -1014,6 +1013,7 @@
 			interrupts = <0 119 4>;
 			interrupt-parent = <&gic>;
 			clock-names = "aclk", "aud_clk";
+			power-domains = <&pd_dp>;
 			xlnx,dp-version = "v1.2";
 			xlnx,max-lanes = <2>;
 			xlnx,max-link-rate = <540000>;
@@ -1063,6 +1063,7 @@
 			xlnx,output-fmt = "rgb";
 			xlnx,vid-fmt = "yuyv";
 			xlnx,gfx-fmt = "rgb565";
+			power-domains = <&pd_dp>;
 		};
 
 		xlnx_dpdma: dma@fd4c0000 {
@@ -1072,6 +1073,7 @@
 			interrupts = <0 122 4>;
 			interrupt-parent = <&gic>;
 			clock-names = "axi_clk";
+			power-domains = <&pd_dp>;
 			dma-channels = <6>;
 			#dma-cells = <1>;
 			dma-video0channel {