usb/179920: Add Lenovo USB 2.0 Ethernet Adapter support by axe(4)

[Koichiro IWAO]

Let me resend with additional information as I forgot CC'ing to 
bug-followup at .

AX88772B was correct. I applied your patch to 9.1-STABLE revision 
251447.
It works and I'm sending this e-mail via Lenovo ethernet adapter.

Logs and result of ifconfig is here.

Jun 25 00:58:19 graphite kernel: ugen1.6: <vendor 0x17ef> at usbus1
Jun 25 00:58:19 graphite kernel: axe0: <vendor 0x17ef product 0x7203, 
rev 2.00/0.01, addr 6> on usbus1
Jun 25 00:58:20 graphite kernel: miibus0: <MII bus> on axe0
Jun 25 00:58:20 graphite kernel: ukphy0: <Generic IEEE 802.3u media 
interface> PHY 16 on miibus0
Jun 25 00:58:20 graphite kernel: ukphy0:  none, 10baseT, 10baseT-FDX, 
100baseTX, 100baseTX-FDX, auto, auto-flow
Jun 25 00:58:20 graphite kernel: ue0: <USB Ethernet> on axe0
Jun 25 00:58:20 graphite kernel: ue0: Ethernet address: 
00:b5:6d:xx:xx:xx
Jun 25 00:58:20 graphite kernel: ue0: link state changed to DOWN

ue0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 
1500
	options=8000b<RXCSUM,TXCSUM,VLAN_MTU,LINKSTATE>
	ether 00:b5:6d:xx:xx:xx
	nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
	media: Ethernet autoselect (none)
	status: no carrier

Thanks,
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