net/mlx5: validate sample action

net/mlx5: validate sample action

Add sample action validate function.

Sample Flow is supported in NIC-RX and FDB domains. For the NIC-RX
the Sample Flow action list must include the destination queue action.

Only NIC-RX domain supports the optional actions list. FDB doesn't
support any optional actions, the sampled packets is always forwarded
to the E-Switch manager port.

Signed-off-by: Jiawei Wang <jiaweiw@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>