make pipewire controllable

[epsilon-0]

Signed-off-by: Aisha Tammy [email protected]

Pull Request check-list

Please make sure to review and check all of these items:

• Does the code keep building with this change?
• Do the unit tests pass with this change?
• Is the commit message formatted according to CONTRIBUTING.MD?
• If this change fixes a bug (or a performance problem), is a regression
  test (or a benchmark) included?
• Is a documentation update included (if this change modifies
  existing APIs, or introduces new ones)

NOTE: these things are not required to open a PR and can be done
afterwards / while the PR is open.

Affected core subsystem(s)

Please provide affected core subsystem(s).

Description of change

Makes pipewire usage be controlled with cmake option. Helps in creating portage builds.