soc/amd/picasso/acpi: use ROOT_BRIDGE macro

Instead of having the different static parts of the PCI0 device in
northbridge.asl and sb_pci0_fch.asl, instantiate the static parts of the
PCI0 device via the ROOT_BRIDGE macro in soc.asl.

TEST=Both Ubuntu 2022.4 and Windows 10 still boot successfully and don't
show any new ACPI-related error.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I2587d8bb270dc3edce9dfa570a5018116fc9187f
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75569
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>

src/soc/amd/picasso/acpi/northbridge.asl

@@ -1,9 +1,5 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
-/* Note: Only need HID on Primary Bus */
-Name(_HID, EISAID("PNP0A08"))	/* PCI Express Root Bridge */
-Name(_CID, EISAID("PNP0A03"))	/* PCI Root Bridge */
-
 /* Describe the Northbridge devices */
 
 Method(_STA, 0, NotSerialized)

src/soc/amd/picasso/acpi/sb_pci0_fch.asl

@@ -3,21 +3,6 @@
 /* System Bus */
 /*  _SB.PCI0 */
 
-/* Operating System Capabilities Method */
-Method(_OSC,4)
-{
-	/* Check for proper PCI/PCIe UUID */
-	If (Arg0 == ToUUID("33DB4D5B-1FF7-401C-9657-7441C03DD766"))
-	{
-		/* Let OS control everything */
-		Return (Arg3)
-	} Else {
-		CreateDWordField(Arg3,0,CDW1)
-		CDW1 |= 4	// Unrecognized UUID
-		Return (Arg3)
-	}
-}
-
 /* 0:14.3 - LPC */
 #include <soc/amd/common/acpi/lpc.asl>
 #include <soc/amd/common/acpi/platform.asl>

src/soc/amd/picasso/acpi/soc.asl

@@ -1,6 +1,10 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
-Device(PCI0) {
+#include <soc/amd/common/acpi/pci_root.asl>
+
+ROOT_BRIDGE(PCI0)
+
+Scope(PCI0) {
 	/* Describe the AMD Northbridge */
 	#include "northbridge.asl"