To support lwIP better (dont require gnrc_ipv6)
Also don't require IPv6 for printing link type
With this sc_gnrc_netif can compile and work when using lwIP
(with l2util module added):
```
> ifconfig
Iface ET1 HWaddr: 24:0A:C4:E6:0E:9C Channel: 6 Link: up
L2-PDU:1500 Source address length: 6
Link type: wireless
inet6 addr: fe80::260a:c4ff:fee6:e9c scope: link
inet6 addr: 2001:db8::260a:c4ff:fee6:e9c scope: global
Iface ET0 HWaddr: 24:0A:C4:E6:0E:9F Link: up
L2-PDU:1500 Source address length: 6
Link type: wired
inet6 addr: fe80::260a:c4ff:fee6:e9f scope: link
inet6 addr: 2001:db8::260a:c4ff:fee6:e9f scope: global
>
```
Still works in gnrc_networking example:
```
> ifconfig
Iface 8 HWaddr: 24:0A:C4:E6:0E:9F Link: up
L2-PDU:1500 MTU:1500 HL:64 RTR
RTR_ADV
Source address length: 6
Link type: wired
inet6 addr: fe80::260a:c4ff:fee6:e9f scope: link VAL
inet6 group: ff02::2
inet6 group: ff02::1
inet6 group: ff02::1:ffe6:e9f
inet6 group: ff02::1a
```
Model the LoRaWAN integration to GNRC's netif command (ifconfig) as
submodule of it, namely `shell_cmd_gnrc_netif_lorawan`.
This should fix a regression introduced by
https://github.com/RIOT-OS/RIOT/pull/18355
Previously `shell_commands` was a "catch-all" module that included
shell commands for each and every used module that has a shell
companion. Instead, the new `shell_cmds` module is now used to provide
shell commands as individually selectable submodules, e.g.
`cmd_gnrc_icmpv6_echo` now provides the ICMPv6 echo command (a.k.a.
ping).
To still have a "catch all" module to pull in shell commands of modules
already used, `shell_cmds_default` was introduced. `shell_commands`
depends now on `shell_cmds_default` for backward compatibility, but
has been deprecated. New apps should use `shell_cmds_default`
instead.
For a handful of shell commands individual selection was already
possible. Those modules now depend on the corresponding `cmd_%` module
and they have been deprecated.
