stage_cache: Disable when APCI S3 is not possible

Don't consume CBMEM for stage cache when we would
never use it.

Change-Id: I606e0457ff3085822554c4041fc56f0d28cc9c2d
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/27230
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/lib/prog_loaders.c

@@ -154,7 +154,8 @@ void run_ramstage(void)
 	} else if (load_nonrelocatable_ramstage(&ramstage))
 		goto fail;
 
-	stage_cache_add(STAGE_RAMSTAGE, &ramstage);
+	if (!IS_ENABLED(CONFIG_NO_STAGE_CACHE))
+		stage_cache_add(STAGE_RAMSTAGE, &ramstage);
 
 	timestamp_add_now(TS_END_COPYRAM);