net: wwan: iosm: fix memory leak in ipc_wwan_dellink

IOSM driver registers network device without setting the
needs_free_netdev flag, and does NOT call free_netdev() when
unregisters network device, which causes a memory leak.

This patch sets needs_free_netdev to true when registers
network device, which makes netdev subsystem call free_netdev()
automatically after unregister_netdevice().

Fixes: 2a54f2c7 ("net: iosm: net driver")
Signed-off-by: HW He <hw.he@mediatek.com>
Reviewed-by: Loic Poulain <loic.poulain@linaro.org>
Signed-off-by: Zhaoping Shu <zhaoping.shu@mediatek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>