ACPI: Add common acpi_fill_gnvs()

Change-Id: I515e830808a95eee3ce72b16fd26da6ec79dac85
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48718
Reviewed-by: Lance Zhao
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/southbridge/intel/i82801gx/lpc.c

@@ -491,12 +491,6 @@ void soc_fill_gnvs(struct global_nvs *gnvs)
 
 void southbridge_inject_dsdt(const struct device *dev)
 {
-	struct global_nvs *gnvs = acpi_get_gnvs();
-	if (!gnvs)
-		return;
-
-	soc_fill_gnvs(gnvs);
-	mainboard_fill_gnvs(gnvs);
 	acpi_inject_nvsa();
 }