xfrm: always initialize offload path

Offload path is used for GRO with SW IPsec, and not just for HW
offload. So initialize it anyway.

Fixes: 585b64f5 ("xfrm: delay initialization of offload path till its actually requested")
Reported-by: Sabrina Dubroca <sd@queasysnail.net>
Closes: https://lore.kernel.org/all/aEGW_5HfPqU1rFjl@krikkit


Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>