Zhe Weng 56ef320d6f nshlib/ifconfig: Add support for add/del a single IPv6 address
Note: We're using similar error codes as Linux:
```
linux> sudo ifconfig eth0 inet6 add fc00::2/64
linux> sudo ifconfig eth0 inet6 del fc00::2/112
SIOCDIFADDR: Cannot assign requested address
linux> sudo ifconfig eth0 inet6 del fc00::3/64
SIOCDIFADDR: Cannot assign requested address
linux> sudo ifconfig eth0 inet6 add fc00::2/64
SIOCSIFADDR: File exists

nuttx> ifconfig eth0 inet6 add fc00::2/64
nuttx> ifconfig eth0 inet6 del fc00::2/112
Failed to manage IPv6 address: Cannot assign requested address
nuttx> ifconfig eth0 inet6 del fc00::3/112
Failed to manage IPv6 address: Cannot assign requested address
nuttx> ifconfig eth0 inet6 add fc00::2/64
Failed to manage IPv6 address: File exists
```

Signed-off-by: Zhe Weng <wengzhe@xiaomi.com>
2023-11-08 00:20:19 +08:00
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