soc/amd/picasso/acpi: rename sb_fch.asl to mmio.asl

This file only contain the ACPI code describing the MMIO devices in the
FCH, so rename it to mmio.asl. This also brings the Picasso ACPI code a
bit more in line with the ACPI code of the newer SoCs.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I64490ba8e34ae1fbe6aea1ab6496b5b04ac4d0aa
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75591
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

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

@@ -19,8 +19,8 @@ Scope(PCI0) {
 /* Describe PCI INT[A-H] for the Southbridge */
 #include <soc/amd/common/acpi/pci_int.asl>
 
-/* Describe the devices in the Southbridge */
-#include "sb_fch.asl"
+/* Describe the MMIO devices in the FCH */
+#include "mmio.asl"
 
 /* Add GPIO library */
 #include <soc/amd/common/acpi/gpio_bank_lib.asl>