sfc: move xdp_features configuration in efx_pci_probe_post_io()

Move xdp_features configuration from efx_pci_probe() to
efx_pci_probe_post_io() since it is where all the other basic netdev
features are initialised.

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/r/9bd31c9a29bcf406ab90a249a28fc328e5578fd1.1675875404.git.lorenzo@kernel.org
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>