net/ice: fix mbuf offload flag for Rx timestamp
net/ice: fix mbuf offload flag for Rx timestamp

For received PTP packets, the flag "RTE_MBUF_F_RX_IEEE1588_TMST" has not
been set which leads to received PTP packet not timestamped by hardware
shown in testpmd/ieee1588 fwd.

Fixes: 646dcbe6c701 ("net/ice: support IEEE 1588 PTP")
Cc: stable@dpdk.org

Signed-off-by: Simei Su <29f5be16939eb93a77dd0e6425e0455815f0eb68@intel.com>
Acked-by: Qi Zhang <9e9e58ffa71a29bb7b87766b362515be648fcbe0@intel.com>

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