app/crypto-perf: add IPsec operations population routine

app/crypto-perf: add IPsec operations population routine

Ops population functions are called in datapath. Keeping it common for
PDCP & DOCSIS would mean ops population would have additional
conditional checks causing the throughput reported to be lower than what
the PMD is capable of.

Separate out routine for IPsec cases and split vector population and op
preparation into two loops to allow 2 rte_rdtsc_precise() calls to
capture cycles consumed for memcpying the vector. Checking the cycle
count from the loop would mean more calls to the same API.

Signed-off-by: Anoob Joseph <anoobj@marvell.com>
Acked-by: Akhil Goyal <gakhil@marvell.com>