addw3: attempt to enable GBE

Change-Id: I4dd6ba9487488ab1efe44618795b546cdc518bc0

src/mainboard/system76/rpl/Kconfig

@@ -31,6 +31,7 @@ config BOARD_SYSTEM76_ADDW3
 	select DRIVERS_GFX_NVIDIA
 	select EC_SYSTEM76_EC_COLOR_KEYBOARD
 	select EC_SYSTEM76_EC_DGPU
+	select MAINBOARD_USES_IFD_GBE_REGION
 	select SOC_INTEL_ALDERLAKE_PCH_S
 
 config BOARD_SYSTEM76_GAZE18

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

@@ -53,7 +53,7 @@ chip soc/intel/alderlake
 			register "pch_pcie_rp[PCH_RP(3)]" = "{
 				.clk_src = 13,
 				.clk_req = 13,
-				.flags = PCIE_RP_LTR | PCIE_RP_AER,
+				.flags = PCIE_RP_LTR | PCIE_RP_CLK_REQ_DETECT,
 			}"
 		end
 
@@ -101,5 +101,7 @@ chip soc/intel/alderlake
 				.flags = PCIE_RP_LTR | PCIE_RP_AER,
 			}"
 		end
+
+		device ref gbe on end
 	end
 end