mb/google/bluey: Add WLAN and SSD PCI devices to devicetree

This commit updates the devicetree for the Google Bluey mainboard
to include entries for the WLAN and SSD PCI devices.

These devices are located on the x1p42100 SoC's PCI domain 0:
- WLAN: device pci 04.0
- SSD:  device pci 06.0

BUG=b:404985109
TEST=Able to build google/bluey.

Change-Id: If0a9491f4178ee9a44c04aea1330b6522dfd9bf0
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/87859
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/bluey/devicetree.cb

@@ -3,5 +3,7 @@
 chip soc/qualcomm/x1p42100
 	device cpu_cluster 0 on end
 	device domain 0 on
+		device pci 04.0 on end # WLAN
+		device pci 06.0 on end # SSD
 	end
 end