net: mana: Use xdp_set_features_flag instead of direct assignment

This patch uses a helper function for assignment of xdp_features.
This change simplifies backports.

Signed-off-by: Konstantin Taranov <kotaranov@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Link: https://lore.kernel.org/r/1698430011-21562-1-git-send-email-haiyangz@microsoft.com


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