meta-pipewire: restore rcar3 Wireplumber sink configuration

meta-pipewire: restore rcar3 Wireplumber sink configuration

The most recent fixes to the Wireplumber sink configuration for the
rcar3 boards (for SPEC-3661) seem to have accidentally been dropped
during the changes for the layer reorganization done for SPEC-3723.
Restore them to get the expected default output sink behavior.

Bug-AGL: SPEC-3661

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: I2a81041629e81746d6990e5604db483e0583ad46
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/25865
Tested-by: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-build: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-boot-test: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>