examples/ip_frag: remove Tx fast free offload flag

examples/ip_frag: remove Tx fast free offload flag

Application uses different pool to allocate direct and indirect
mbufs which are further spliced together to consturct a fragmented
packet and same is transmitted over the port which is configured
with DEV_TX_OFFLOAD_MBUF_FAST_FREE enabled i.e. all segments
must belong to the same pool. But constructed packet violates
the conditions.

So fixing DEV_TX_OFFLOAD_MBUF_FAST_FREE flag during device
configuration.

Fixes: fdb9eff67f0c ("examples/ip_fragmentation: convert to new offloads API")
Cc: stable@dpdk.org
Signed-off-by: Sunil Kumar Kori <skori@marvell.com>
Reviewed-by: Jerin Jacob <jerinj@marvell.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>