Revert "printk: export symbols for debug modules"

This reverts commit 3e00123a.

No, we never export random symbols for out of tree modules.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20230905081902.321778-1-hch@lst.de

kernel/printk/printk.c

@@ -538,14 +538,12 @@ char *log_buf_addr_get(void)
 {
 	return log_buf;
 }
-EXPORT_SYMBOL_GPL(log_buf_addr_get);
 
 /* Return log buffer size */
 u32 log_buf_len_get(void)
 {
 	return log_buf_len;
 }
-EXPORT_SYMBOL_GPL(log_buf_len_get);
 
 /*
  * Define how much of the log buffer we could take at maximum. The value