test: remove CRC offload for bonding slave
test: remove CRC offload for bonding slave

Link bonding unit tests uses net_null vdev as slaves,
and trying to configure DEV_RX_OFFLOAD_CRC_STRIP as offload
flags to vdev is not correct as vdev doesn't support offloads.

The unit test is reporting this as failure, so fix this by
removing the offloads.

Fixes: c6698a3e8f ("ethdev: convert remaining apps to new offload API")

Signed-off-by: Reshma Pattan <4d9eb35579760ed1c2db754a6b402039c9c8a1cb@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk