mb/google/mancomb: Enable PCIe devices in devicetree

BUG=b:182211161
TEST=builds

Signed-off-by: Eric Lai <ericr_lai@compal.corp-partner.google.com>
Change-Id: Id6c20b32ddafe415132ce70abf5381ff3aad13f7
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52118
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>

src/mainboard/google/mancomb/variants/baseboard/devicetree.cb

@@ -39,6 +39,11 @@ chip soc/amd/cezanne
 	}"
 
 	device domain 0 on
+		device ref gpp_bridge_0 on end # WLAN
+		device ref gpp_bridge_1 on end # SD
+		device ref gpp_bridge_2 on end # LAN
+		device ref gpp_bridge_3 on end # NVMe
+
 		device ref gpp_bridge_a on  # Internal GPP Bridge 0 to Bus A
 			device ref gfx on end # Internal GPU (GFX)
 		end