arm64: zynqmp: Add power domain description for PL

PL has own power domain which is not described in DT. That's why add it
there by default.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/b38e2ea95dab434bc007f9ed6c438c68149744bf.1652262769.git.michal.simek@amd.com
diff --git a/arch/arm/dts/zynqmp.dtsi b/arch/arm/dts/zynqmp.dtsi
index a0f664a..dae8f06 100644
--- a/arch/arm/dts/zynqmp.dtsi
+++ b/arch/arm/dts/zynqmp.dtsi
@@ -218,6 +218,7 @@
 		#address-cells = <2>;
 		#size-cells = <2>;
 		ranges;
+		power-domains = <&zynqmp_firmware PD_PL>;
 	};
 
 	amba: axi {