test/eventdev: fix producer core validity checks
test/eventdev: fix producer core validity checks

When producer type is event timer adapter producer lcore checks are
skipped. Since, timer adapter relies on SW to arm timers producer lcore
is essential for its functionality.
Verify producer lcore validity when producer type is event timer
adapter.

Fixes: b01974da9f25 ("app/eventdev: add ethernet device producer option")
Cc: stable@dpdk.org

Signed-off-by: Pavan Nikhilesh <8184a94f8f7778086ea0697cdb513b2e42813b09@marvell.com>
Acked-by: Jerin Jacob <352c4d4f9291b869992ddb67daa45ddc149fed30@marvell.com>

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