Revert "ANDROID: fs: FS tracepoints to track IO."

This reverts 'commit 5089c1e8 ("ANDROID: fs: FS
tracepoints to track IO" )', which was calling dput
in atomic context, resultig in BUG reported by scheduler.

Conflicts:
	fs/mpage.c

Change-Id: Iad84bf50ab29699125d04e23801cc913c13d53f3
Signed-off-by: Imran Khan <kimran@codeaurora.org>