ANDROID: f2fs: fix wrong android tracepoint

f2fs_submit_page_bio is called from in-place-write case.
Let's not assume read path only.

Fixes: 8a007427 ("ANDROID: f2fs: Complement "android_fs" tracepoint of read path")
Change-Id: I9bb8b7833d57c4342b318da52e4353f70acc3eb0
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>