ak-build.sh: Update for Use Sabermod
opp4xxx_data.c: GPU Steps: 192, 384, 512
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