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>

src/include/acpi/acpi_gnvs.h

@@ -16,4 +16,21 @@ size_t gnvs_size_of_array(void);
 uint32_t *gnvs_cbmc_ptr(void);
 void *gnvs_chromeos_ptr(void);
 
+/*
+ * Creates acpi gnvs and adds it to the DSDT table.
+ * GNVS creation is chipset specific and is done in soc specific acpi.c file.
+ */
+struct device;
+void southbridge_inject_dsdt(const struct device *device);
+
+/*
+ * This function populates the gnvs structure in acpi table.
+ * Defined as weak in common acpi as gnvs structure definition is
+ * chipset specific.
+ */
+struct global_nvs;
+
+void acpi_create_gnvs(struct global_nvs *gnvs);
+void acpi_init_gnvs(struct global_nvs *gnvs);
+
 #endif