modules: unexport __module_address

__module_address is only used by built-in code.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NJessica Yu <jeyu@kernel.org>

kernel/module.c

@@ -4464,7 +4464,6 @@ struct module *__module_address(unsigned long addr)
 	}
 	return mod;
 }
-EXPORT_SYMBOL_GPL(__module_address);
 
 /*
  * is_module_text_address - is this address inside module code?