mb/system76/rpl: Declare child device on GLAN port

Declare a child device on the GLAN port so the Ethernet controller is
detected as an onboard device (eno) and not a plugged device (enp).

Change-Id: I43f1b3b749081fd989bb2e5c04f3b616642a5a4f
Signed-off-by: Tim Crawford <tcrawford@system76.com>

src/mainboard/system76/rpl/variants/addw3/overridetree.cb

@@ -55,6 +55,7 @@ chip soc/intel/alderlake
 				.clk_req = 13,
 				.flags = PCIE_RP_LTR | PCIE_RP_CLK_REQ_DETECT,
 			}"
+			device pci 00.0 on end
 		end
 
 		device ref pcie_rp5 on

src/mainboard/system76/rpl/variants/gaze18/overridetree.cb

@@ -70,6 +70,7 @@ chip soc/intel/alderlake
 				.clk_req = 6,
 				.flags = PCIE_RP_LTR | PCIE_RP_AER,
 			}"
+			device pci 00.0 on end
 		end
 		device ref pcie_rp10 on
 			# PCH RP#10 x1, Clock 2 (WLAN)

src/mainboard/system76/rpl/variants/oryp11/overridetree.cb

@@ -91,6 +91,7 @@ chip soc/intel/alderlake
 				.clk_req = 6,
 				.flags = PCIE_RP_LTR | PCIE_RP_AER,
 			}"
+			device pci 00.0 on end
 		end
 	end
 end

src/mainboard/system76/rpl/variants/serw13/overridetree.cb

@@ -55,6 +55,7 @@ chip soc/intel/alderlake
 				.clk_req = 13,
 				.flags = PCIE_RP_LTR | PCIE_RP_AER,
 			}"
+			device pci 00.0 on end
 		end
 
 		device ref pcie_rp5 on