agl-compositor-init-pipewire: Add a new package

agl-compositor-init-pipewire: Add a new package

That will enable both DRM+PipeWire backends. We depend on
agl-compositor-ini as that contains the original systemd unit service,
and it installs on its own a system drop in service file.

Bug-AGL: SPEC-5235
Change-Id: I0a8319e979217275b1e29cc3aa6c12986639ddd8
Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/30619
Tested-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>