Tuner HAL Remove Outdated Filter Buffer Comment

The filter BUFFER_SIZE parameter currently contains a
comment stating that changing its size may cause sudden
crashes due to problems with memory management. This
problem has since been found and solved. Since the buffer
size is no longer a likely source of errors, this comment
should be removed.

Test: Comment only change
Bug: 236847284 introduced this comment, 239741712
covered the real root cause

Change-Id: I9344d136c7220f54d8c66dd4f4da68890b841886