net: gtp: Remove generic .ndo_get_stats64

Commit 3e2f544d ("net: get stats64 if device if driver is
configured") moved the callback to dev_get_tstats64() to net core, so,
unless the driver is doing some custom stats collection, it does not
need to set .ndo_get_stats64.

Since this driver is now relying in NETDEV_PCPU_STAT_TSTATS, then, it
doesn't need to set the dev_get_tstats64() generic .ndo_get_stats64
function pointer.
Signed-off-by: Breno Leitao <leitao@debian.org>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
Link: https://lore.kernel.org/r/20240305121524.2254533-2-leitao@debian.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/gtp.c

@@ -940,7 +940,6 @@ static const struct net_device_ops gtp_netdev_ops = {
 	.ndo_init		= gtp_dev_init,
 	.ndo_uninit		= gtp_dev_uninit,
 	.ndo_start_xmit		= gtp_dev_xmit,
-	.ndo_get_stats64	= dev_get_tstats64,
 };
 
 static const struct device_type gtp_type = {