Use smp barrier instead of IO barrier when sending mbox request as the
write has to be reflected between cores not IO devices.
Fixes: 6da9d24574db ("event/octeontx: add mailbox support")
Cc: stable@dpdk.org
Signed-off-by: Pavan Nikhilesh <pbhagavatula@caviumnetworks.com>
Acked-by: Santosh Shukla <santosh.shukla@caviumnetworks.com>
b6f26c9db2