net/ark: remove use of seqn for debug
net/ark: remove use of seqn for debug

The seqn mbuf field is deprecated.
It is currently hacked for debug purpose, it could be changed to a
dynamic field but I see little value in the debug info it offers.

Signed-off-by: David Marchand <f28529695cfa9e3e1eb84e7072aa626af4abb18e@redhat.com>
Acked-by: Ed Czeck <a384970125e38497eff503dd5d94acd096b1b3e4@atomicrules.com>

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