[tools/perf] Add khokhlov as results_processor and tbmv3 owner

And remove perezju.

Bug: 1029008
Change-Id: I4fc67136b7816b687ff1c902d5b7b75e176e766a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1944471Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Reviewed-by: Mikhail Khokhlov <khokhlov@google.com>
Commit-Queue: Juan Antonio Navarro Pérez <perezju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721030}

tools/perf/core/results_processor/OWNERS

+khokhlov@google.com

tools/perf/core/tbmv3/OWNERS

-perezju@chromium.org
 dproy@chromium.org
+khokhlov@google.com