sheye: SchedAssert: Add getStartTime and getEndTime
sheye: SchedAssert: Add getStartTime and getEndTime

These functions facilitate calculation of the start and
end time of PID relative to the start time of the trace.

Change-Id: Iff0174109050153b681c86e2a11a86e929cce7f3
Signed-off-by: Kapileshwar Singh <d373e2b6407ea84be359ce4a11e8631121819e79@arm.com>

ARM-software/bart,sinkap/bart,JaviMerino/bart