CBMEM: Implement cbmem_run_init_hooks() stub

Until we completely can unify early_variables, use these to
handle CBMEM update hooks for both romstage and ramstage.

For x86, CAR_MIGRATE serves the purpose of romstage hooks.

Change-Id: I100ebc0e35e1b7091b4f287ca37f539fd7c9fa7a
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/7876
Reviewed-by: Aaron Durbin <adurbin@google.com>
Tested-by: build bot (Jenkins)

src/lib/cbmem.c

@@ -243,7 +243,7 @@ int cbmem_recovery(int is_wakeup)
 		cbmem_fail_resume();
 	}
 
-	cbmem_arch_init();
+	cbmem_run_init_hooks();
 	car_migrate_variables();
 	return !found;
 }