simpleperf: update simpleperf prebuilts to build 3839284.

Taken from branch aosp-master.
And remove update.py from the distribution.

Bug: http://b/35726123
Test: run pprof_proto_generator.py.

Change-Id: I9b8e0c2f804c5e61ef1c9b1eb1aa626d0d849f64
17 files changed