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>
diff --git a/src/soc/intel/broadwell/adsp.c b/src/soc/intel/broadwell/adsp.c
index 897f9c4..15858e1 100644
--- a/src/soc/intel/broadwell/adsp.c
+++ b/src/soc/intel/broadwell/adsp.c
@@ -80,7 +80,7 @@
 
 	if (config->sio_acpi_mode) {
 		/* Configure for ACPI mode */
-		global_nvs_t *gnvs;
+		struct global_nvs *gnvs;
 
 		printk(BIOS_INFO, "ADSP: Enable ACPI Mode IRQ3\n");