pipewire: Update pw to v0.3.47 and wp to v0.4.8

pipewire: Update pw to v0.3.47 and wp to v0.4.8

Highlights of Pipewire.
- Removed check and warnings to catch leaked listeners on the proxy.
- Fix critical bug where alsa devices would not show when the kernel
  was compiled without VERBOSE_PROCFS
- Almost all limits on number of ports, clients and nodes are removed.
- Many more bug fixes and imporovements.

Highlights of Wireplumber.
- Added bluetooth profile auto-switching support between A2DP and HFP
  modes
- Better default audio sources and sinks selection
- Backported a fix for a known issue with selecting the default
  devices on top of 0.4.8 (ae6c9a5e)
- Many more bug fixes and imporovements.

Change-Id: Id5414aed065593893a237437a8c77645cbf15804
Signed-off-by: Ashok Sidipotu <ashok.sidipotu@collabora.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/27220
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Tested-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>