aries | p1: trace/events: fix gpu event timestamp formatting

This change fixes the how the gpu_sched_switch timestamp field is formatted.

Signed-off-by: Jamie Gennis <jgennis@google.com>
Change-Id: I273234935254ed15772c9e561c9af20e480004ae
Merge "aries | p1: trace/events: fix gpu event timestamp formatting" into android-4.4