jack: apply some improvements

- Remove the do_install append because jack_control no longer
  builds when the dbus pkgconfig is disabled.
- Add python3-core to the runtime dependencies when D-Bus is
  enabled, because jack_control requires /usr/bin/python3.
- Use PACKAGE_BEFORE_PN to enable additional packages.
- Remove the HTML documentation because it no longer builds.

Signed-off-by: Thomas Perrot <thomas.perrot@bootlin.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>