mb/system76/ptl: Try configuring GPE

Change-Id: If62fd5fc033b6dbeba1b74e9f4fc27f5f0ef40e2
Signed-off-by: Tim Crawford <tcrawford@system76.com>

Author: crawfxrd

src/mainboard/system76/ptl/devicetree.cb

@@ -31,6 +31,11 @@ chip soc/intel/pantherlake
 				device pnp 0c31.0 on end
 			end
 		end
+		device ref pmc hidden
+			register "pmc_gpe0_dw0" = "GPP_A"
+			register "pmc_gpe0_dw1" = "GPP_D"
+			register "pmc_gpe0_dw2" = "GPP_E"
+		end
 		device ref hda on
 			register "pch_hda_audio_link_hda_enable" = "1"
 			register "pch_hda_sdi_enable[0]" = "true"