NXP HAL should support IPv6 only configuration in networking middleware

[jukkar]

Is your enhancement proposal related to a problem? Please describe.
I tried to compile a IPv6 only Wi-Fi application for frdm-rw612 board. The IPv6 only snippet can be found in #87644

west build -p \
-d ~/zephyrproject/build/zperf-nxp \
~/zephyrproject/zephyr/samples/net/zperf/ \
-b frdm_rw612 \
-S wifi-ipv6

Compiling this I also needed #87573 and #87410

The building fails with this message

zephyrproject/modules/hal/nxp/mcux/middleware/wifi_nxp/port/net/zephyr/net.c: In function 'stop_cb':
zephyrproject/modules/hal/nxp/mcux/middleware/wifi_nxp/port/net/zephyr/net.c:990:5: warning: implicit declaration of function 'net_dhcpv4_stop'; did you mean 'net_dhcpv6_stop'? [-Wimplicit-function-declaration]
  990 |     net_dhcpv4_stop(if_handle->netif);
      |     ^~~~~~~~~~~~~~~
      |     net_dhcpv6_stop
zephyrproject/modules/hal/nxp/mcux/middleware/wifi_nxp/port/net/zephyr/net.c: In function 'net_configure_address':
zephyrproject/modules/hal/nxp/mcux/middleware/wifi_nxp/port/net/zephyr/net.c:1150:13: warning: implicit declaration of function 'net_dhcpv4_restart'; did you mean 'net_dhcpv6_restart'? [-Wimplicit-function-declaration]
 1150 |             net_dhcpv4_restart(if_handle->netif);
      |             ^~~~~~~~~~~~~~~~~~
      |             net_dhcpv6_restart
zephyrproject/modules/hal/nxp/mcux/middleware/wifi_nxp/port/net/zephyr/net.c: In function 'net_get_if_addr':
zephyrproject/modules/hal/nxp/mcux/middleware/wifi_nxp/port/net/zephyr/net.c:1201:60: error: 'struct net_if_ip' has no member named 'ipv4'; did you mean 'ipv6'?
 1201 |     struct net_if_ipv4 *ipv4 = if_handle->netif->config.ip.ipv4;
      |                                                            ^~~~
      |                                                            ipv6
zephyrproject/modules/hal/nxp/mcux/middleware/wifi_nxp/port/net/zephyr/net.c: In function 'net_get_if_ip_addr':
zephyrproject/modules/hal/nxp/mcux/middleware/wifi_nxp/port/net/zephyr/net.c:1399:60: error: 'struct net_if_ip' has no member named 'ipv4'; did you mean 'ipv6'?
 1399 |     struct net_if_ipv4 *ipv4 = if_handle->netif->config.ip.ipv4;
      |                                                            ^~~~
      |                                                            ipv6
zephyrproject/modules/hal/nxp/mcux/middleware/wifi_nxp/port/net/zephyr/net.c: In function 'net_get_if_ip_mask':
zephyrproject/modules/hal/nxp/mcux/middleware/wifi_nxp/port/net/zephyr/net.c:1408:60: error: 'struct net_if_ip' has no member named 'ipv4'; did you mean 'ipv6'?
 1408 |     struct net_if_ipv4 *ipv4 = if_handle->netif->config.ip.ipv4;
      |                                                            ^~~~
      |                                                            ipv6
[392/565] Building C object modules/hal_nxp/hal_nxp/CMakeFiles/..__modules__hal__nxp.dir/mcux/middleware/wifi_nxp/wlcmgr/wlan.c.obj

Describe the solution you'd like
As Zephyr supports IPv6 only configuration, it should be able to build also with this HAL.