simpleperf: fix presubmit test.

cuttlefish is changed to mount tracefs in
/sys/kernel/tracing instead of /sys/kernel/debug/tracing.
So try both tracefs locations.

Bug: 148521916
Test: run simpleperf_unit_test.
Change-Id: I6052fd3feb14d5e93334e5e95704e1fa173fac25
5 files changed