When there are more timing_stop() calls then timing_start(),
the reference counter will go negative, resulting in the next
timing_start() call not starting the timer. Without timer
running, getting cycles elasped would not work. So fix
the ref counting so it won't dip below zero.
Fixes#30397
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
We should not be initializing/starting/stoping timing functions
multiple times. So this changes how the timing functions are
structured to allow only one initialization, only start when
stopped, and only stop when started.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
