app/crypto-perf: fix CSV output format

app/crypto-perf: fix CSV output format

The csv output for each ptest type used ";" instead of ",".
This has now been fixed to use the comma format that is used in the csv
headers.

Fixes: f6cefe253cc8 ("app/crypto-perf: add range/list of sizes")
Fixes: 96dfeb609be1 ("app/crypto-perf: add new PMD benchmarking mode")
Fixes: da40ebd6d383 ("app/crypto-perf: display results in test runner")
Cc: stable@dpdk.org
Signed-off-by: Ciara Power <ciara.power@intel.com>
Acked-by: Declan Doherty <declan.doherty@intel.com>
Acked-by: Adam Dybkowski <adamx.dybkowski@intel.com>