perf machine: Explicitly pass in host perf_env

When creating a machine for the host explicitly pass in a scoped
perf_env. This removes a use of the global perf_env.

Signed-off-by: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/20250724163302.596743-17-irogers@google.com


Signed-off-by: Namhyung Kim <namhyung@kernel.org>