mb/google/poppy/variant/nocturne: correct wifi wake register

Wifi wake register is incorrectly set in devicetree.
Set wifi wake to its correct wake source, GPE0_DW2_01.

BUG=b:117330593
TEST='emerge-nocturne coreboot chromeos-bootimage', flash nocture,
connect wifi to a hotspot, suspend device, echo freeze >
/sys/power/state, and then shutdown the hotspot and verify device
wakes.

Change-Id: Iafa865ca79d33541d7f47b69d2fb209e7f9c98af
Signed-off-by: Nick Vaccaro <nvaccaro@google.com>
Reviewed-on: https://review.coreboot.org/28938
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/poppy/variants/nocturne/devicetree.cb

@@ -393,7 +393,7 @@ chip soc/intel/skylake
 		end # I2C #4 - Audio
 		device pci 1c.0 on
 			chip drivers/intel/wifi
-				register "wake" = "GPE0_PCI_EXP"
+				register "wake" = "GPE0_DW2_01"
 				device pci 00.0 on end
 			end
 		end # PCI Express Port 1