webos: pipewire: remove webrtc-echo-cancelling PACKAGECONFIG

:Release Notes:
Remove webrtc-echo-cancelling because newer webrtc-audio-processing
from meta-webos isn't compatible with pipewire expectations.

:Detailed Notes:
fails to build with: meson.build:361:0: ERROR: Dependency 'webrtc-audio-processing' not found, tried pkgconfig
http://gecko.lge.com:8000/Errors/Details/588440

:Testing Performed:
Only build tested.

:QA Notes:
No change to image.

:Issues Addressed:
[WRQ-693] Create GPVB with Yocto 4.2 Mickledore

Change-Id: I1a5170a8cb8f3adb3b7393ee1ff5ba740c535d1d

meta-webos/recipes-multimedia/pipewire/pipewire_%.bbappend

@@ -0,0 +1,8 @@
+# Copyright (c) 2023 LG Electronics, Inc.
+
+EXTENDPRAUTO:append = "webos1"
+
+# fails to build with: meson.build:361:0: ERROR: Dependency 'webrtc-audio-processing' not found, tried pkgconfig
+# http://gecko.lge.com:8000/Errors/Details/588440
+# this is because of newer version in ./meta-webos/recipes-multimedia/webrtc-audio-processing/webrtc-audio-processing_1.0.bb used by pulseaudio
+PACKAGECONFIG:remove = "webrtc-echo-cancelling"