ACPI: Select ACPI_SOC_NVS only where suitable

Having some symmetry with <soc/nvs.h> now allows to reduce
the amount of gluelogic to determine the size and cbmc field
of struct global_nvs.

Since GNVS creation is now controlled by ACPI_SOC_NVS,
drivers/amd/agesa/nvs.c becomes obsolete and soc/amd/cezanne
cannot have this selected until <soc/nvs.h> exists.

Change-Id: Ia9ec853ff7f5e7908f7e8fc179ac27d0da08e19d
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49344
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Lance Zhao

src/lib/hardwaremain.c

@@ -449,7 +449,7 @@ void main(void)
 	threads_initialize();
 
 	/* Initialise GNVS early. */
-	if (CONFIG(HAVE_ACPI_TABLES))
+	if (CONFIG(ACPI_SOC_NVS))
 		gnvs_get_or_create();
 
 	/* Schedule the static boot state entries. */