[tools/perf] Depend on trace_processor_shell on all platforms

Now that trace_processor_shell can be built on Android, we can add
it to dependencies, and eventually use for proto2json conversion
on host.

Bug: 1028612
Change-Id: Ia92c8a9a0d70e4a491e657f635d40102b7392993
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1978003
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Reviewed-by: Eric Seckler <eseckler@chromium.org>
Commit-Queue: Mikhail Khokhlov <khokhlov@google.com>
Cr-Commit-Position: refs/heads/master@{#727157}