wireplumber: remove virtual RPROVIDES

wireplumber: remove virtual RPROVIDES

Remove the "virtual/pipewire-sessionmanager" RPROVIDES from the
meta-pipewire wireplumber recipe, as it is unused and latest
upstream now warns about the use of "virtual/" prefixes in
RPROVIDES.

Bug-AGL: SPEC-5067

Change-Id: I80fcd30a0eada4a270c95a126c8756574fb72f24
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/29653
ci-image-build: Jenkins Job builder account
Tested-by: Jenkins Job builder account
ci-image-boot-test: Jenkins Job builder account
(cherry picked from commit 3875a429f6b8dfa445de00bfbe77fd71acfb695a)
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/29622
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>