Revert "CHROMIUM: Add CLOCK_SYSTEM_TRACE to export the trace clock to user space."

CQ-DEPEND=CL:303497
BUG=chromium:324025
TEST=build/boot 3.8 on link

This reverts commit 8cea67ed158537c3d6cdd8ad01c4ee73bd2dbcf7.
Signed-off-by: Sonny Rao <[email protected]>
[SR: trivial, conflicted with 0c3b86472c trace: allow ftrace to be
 disabled/enabled per cpu]
Conflicts:
	include/linux/kernel.h

Change-Id: Iad71fd4557de16ec4f97b8f896237d01ec8d3f94
Reviewed-on: https://chromium-review.googlesource.com/300596
Commit-Ready: Sonny Rao <[email protected]>
Tested-by: Sonny Rao <[email protected]>
Reviewed-by: Olof Johansson <[email protected]>
4 files changed
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