mm: Do not periodically flush dirty pages

Let dirty_ratio handle this, do not use a constant timer to flush data
to the disk.

Signed-off-by: Tyler Nijmeh <tylernij@gmail.com>
Signed-off-by: Rapherion Rollerscaperers <rapherion@raphielgang.org>
Signed-off-by: CloudedQuartz <ravenklawasd@gmail.com>

mm/page-writeback.c

@@ -99,7 +99,7 @@ unsigned long vm_dirty_bytes;
 /*
  * The interval between `kupdate'-style writebacks
  */
-unsigned int dirty_writeback_interval = 5 * 100; /* centiseconds */
+unsigned int dirty_writeback_interval; /* centiseconds */
 
 EXPORT_SYMBOL_GPL(dirty_writeback_interval);