acpi: remove CBMEM_ID_ACPI_GNVS_PTR entry

Since we can retrieve the address of ACPI GNVS directly
from CBMEM_ID_ACPI_GNVS, there is no need to store and
update a pointer separately.

TEST=Compile and run on Eve

Signed-off-by: Joel Kitching <kitching@google.com>
Change-Id: I59f3d0547a4a724e66617c791ad82c9f504cadea
Reviewed-on: https://review.coreboot.org/28189
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/southbridge/intel/fsp_rangeley/lpc.c

@@ -434,7 +434,6 @@ static void southbridge_inject_dsdt(struct device *dev)
 	if (gnvs) {
 		memset(gnvs, 0, sizeof(*gnvs));
 		acpi_create_gnvs(gnvs);
-		acpi_save_gnvs((unsigned long)gnvs);
 #if IS_ENABLED(CONFIG_HAVE_SMI_HANDLER)
 		/* And tell SMI about it */
 		smm_setup_structures(gnvs, NULL, NULL);