wireplumber: Add Equalizer filter chain node

wireplumber: Add Equalizer filter chain node

- The filter has two bands one for bass and another one for treble.
- The filter node attaches itself to multimedia endpoint, this setting
  is configurable.
- Also add a patch to fix the dangling logs issue in the endpoints
  policy.

Bug-AGL: SPEC-4931
Change-Id: Ibb3f56ac40eedc8c30445186624e50cbb3049afa
Signed-off-by: Ashok Sidipotu <ashok.sidipotu@collabora.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/29466
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Tested-by: Jenkins Job builder account