meta-pipewire: remove local pipewire recipe to track meta-openembedded

meta-openembedded/scarthgap already has 1.0.5, which is great!

The local systemd unit dir patch has been dropped, as the upstream
recipe uses a meson option to set the correct unit path.

Bug-AGL: SPEC-5129
Change-Id: I7b156093f20821eae0c9db2a1d96feff68d81547
Signed-off-by: George Kiagiadakis <george.kiagiadakis@collabora.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/30037
ci-image-build: Jenkins Job builder account
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
ci-image-boot-test: Jenkins Job builder account
Reviewed-by: Marius Vlad <marius.vlad@collabora.com>
Tested-by: Jenkins Job builder account