rp2/cyw43_configport: Fix cyw43 mDNS by properly starting mDNS on netif.

The rp2 port has an incomplete mDNS implementation.  The code in `main.c`
calls `mdns_resp_init()` which opens the UDP socket for mDNS.  However, no
code in the cyw43 driver makes the proper calls to `mdns_resp_add_netif()`
and `mdns_resp_remove_netif()` to send the announce packets.  The wiznet5k
driver does make these calls and was used as a model for these changes.

This commit attempts to address this by very small changes to the
`ports/rp2/cyw43_configport.h` file.  The change uses new cyw43 driver
hooks to map the driver macros `CYW43_CB_TCPIP_INIT_EXTRA` and
`CYW43_CB_TCPIP_DEINIT_EXTRA` to the appropriate lwIP mDNS calls.

Fixes issue #15297.

Signed-off-by: Mark Seminatore <nebula_peeps4t@icloud.com>

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