app/bbdev: improve readability
app/bbdev: improve readability

Improve readability of test application by replacing
int values with rte_bbdev_event_type enum.

Signed-off-by: Kamil Chalupnik <c7c7f2e2b7385d351318e38bf696bb3799e6c9de@intel.com>
Acked-by: Pablo de Lara <28355d9cfe41bb8148aea0fb24f47aae8f4217a1@intel.com>

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