mainboards using soc/amd/picasso: use aliases for PCIe devices on bus 0

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Ia6199c70163d32467abe5ba5da55c73ff62ba10f
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55103
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>

util/mainboard/google/trembyle/template/overridetree.cb

@@ -37,7 +37,7 @@ chip soc/amd/picasso
 	# See AMD 55570-B1 Table 13: PCI Device ID Assignments.
 	device domain 0 on
 		subsystemid 0x1022 0x1510 inherit
-		device pci 1.7 on  end # GPP Bridge 6 - NVME
+		device ref gpp_bridge_6 on end # NVME
 	end # domain
 
 	device mmio 0xfedc4000 on end