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When Link Time Optimization is turned on, functions that set
task_waiting multiple times have one of the sets removed
by the linker leading to undesired results.
Marking task_waiting volatile alleviates this issue.
BUG=chrome-os-partner:46063
TEST=Manually tested on Kunimitsu.
Console command adc shows correct value of approx
20000 mV for VBUS.
BRANCH=none
Change-Id: I85a6e5c9688ae72c45d90fb58296f94b74a301aa
Signed-off-by: Shamile Khan <shamile.khan@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/314233
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>