CNB97: bridge: update bridge core to upstream v6.15.

mheibrequested to merge
mheib/centos-stream-9:bridge_switchdev-6.15-75594 into main

JIRA: https://issues.redhat.com/browse/RHEL-75594

update bridge core to upstream v6.15.

Signed-off-by: Mohammad Heib mheib@redhat.com

Edited by mheib

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