ACPI: Declare GNVS variables globally

There is a common place where acpigen generates these,
so the declarations for the OperationRegions should be
centralized too.

Change-Id: I772492ca9e651b60244c565d1e926dc2ad33cfd8
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49795
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/baytrail/acpi/device_nvs.asl

@@ -1,8 +1,5 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
-External (NVSD)
-
-OperationRegion (DNVS, SystemMemory, NVSD, 0x1000)
 Field (DNVS, ByteAcc, NoLock, Preserve)
 {
 	/* Device Enabled in ACPI Mode */

src/soc/intel/baytrail/acpi/globalnvs.asl

@@ -4,16 +4,6 @@
 
 Name(\PICM, 0)		/* IOAPIC/8259 */
 
-/*
- * Global ACPI memory region. This region is used for passing information
- * between coreboot (aka "the system bios"), ACPI, and the SMI handler.
- * Since we don't know where this will end up in memory at ACPI compile time,
- * we have to fix it up in coreboot's ACPI creation phase.
- */
-
-External (NVSA)
-
-OperationRegion (GNVS, SystemMemory, NVSA, 0x1000)
 Field (GNVS, ByteAcc, NoLock, Preserve)
 {
 	/* Miscellaneous */