I hit this after updating to 10 from a year-old 9.1-STABLE. I rolled the system back, 9.1 is reporting:
% dmesg | grep msk
mskc0: <Marvell Yukon 88E8057 Gigabit Ethernet> port 0xe000-0xe0ff mem 0xfea20000-0xfea23fff irq 16 at device 0.0 on pci3
msk0: <Marvell Technology Group Ltd. Yukon Ultra 2 Id 0xba Rev 0x00> on mskc0
msk0: Ethernet address: dc:9c:52:07:a5:92
miibus0: <MII bus> on msk0