stage_cache: Add rmodule params in metadata

The change allows to update rmodule parameters after
it has been loaded from stage cache.

Change-Id: Ib825ffe245d447ad3a8246f7dbd52c6e34103a0c
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/21385
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/include/stage_cache.h

@@ -37,6 +37,7 @@ void stage_cache_external_region(void **base, size_t *size);
 struct stage_cache {
 	uint64_t load_addr;
 	uint64_t entry_addr;
+	uint64_t arg;
 };
 
 #endif /* _STAGE_CACHE_H_ */