Revert^2 "Add f2fs_write_end and improve trace size"

This reverts commit 3a321aa539f31872a4d37b9a2b48c65c33162e5c.

Reason for revert: The regression was not caused by this cl. unreverting 

Change-Id: Iaae3771833b53e2c0a22ca47ff9b57c110b185ac
2 files changed