eth: gve: use appropriate helper to set xdp_features

Commit f85949f9 ("xdp: add xdp_set_features_flag utility routine")
added routines to inform the core about XDP flag changes.
GVE support was added around the same time and missed using them.

GVE only changes the flags on error recover or resume.
Presumably the flags may change during resume if VM migrated.
User would not get the notification and upper devices would
not get a chance to recalculate their flags.

Fixes: 75eaae15 ("gve: Add XDP DROP and TX support for GQI-QPL format")
Reviewed-By: Jeroen de Borst <jeroendb@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20250106180210.1861784-1-kuba@kernel.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>