Merge branch 'net-dsa-yt921x-add-stp-mst-support'David Yang says:====================net: dsa: yt921x: Add STP/MST supportSupport for these features was deferred from the initial submission of thedriver.v3: https://lore.kernel.org/20251126093240.2853294-1-mmyangfl@gmail.comv2: https://lore.kernel.org/20251025170606.1937327-1-mmyangfl@gmail.comv1: https://lore.kernel.org/20251024033237.1336249-1-mmyangfl@gmail.com====================Link: https://patch.msgid.link/20251201094232.3155105-1-mmyangfl@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>