modules: unexport __module_text_address

__module_text_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

@@ -4503,7 +4503,6 @@ struct module *__module_text_address(unsigned long addr)
 	}
 	return mod;
 }
-EXPORT_SYMBOL_GPL(__module_text_address);
 
 /* Don't grab lock, we're oopsing. */
 void print_modules(void)