ACPI: Drop typedef global_nvs_t

Bring all GNVS related initialisation function to global
scope to force identical signatures. Followup work is
likely to remove some as duplicates.

Change-Id: Id4299c41d79c228f3d35bc7cb9bf427ce1e82ba1
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42489
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

util/autoport/bd82x6x.go

@@ -362,7 +362,7 @@ void mainboard_get_spd(spd_raw_data *spd, bool id_only)
 	gnvs.WriteString(`#include <southbridge/intel/bd82x6x/nvs.h>
 
 /* FIXME: check this function.  */
-void acpi_create_gnvs(global_nvs_t *gnvs)
+void acpi_create_gnvs(struct global_nvs *gnvs)
 {
 	/* Disable USB ports in S3 by default */
 	gnvs->s3u0 = 0;