Octeontx2 SSO co-processor allows multiple ethernet device Rx queues
connected to a single Event device queue.
Fix the Rx adapter capabilities to allow application to configure
Rx queueus in n:1 ratio to event queues by adding
`RTE_EVENT_ETH_RX_ADAPTER_CAP_MULTI_EVENTQ` as a capability.
Fixes: 37720fc1fba8 ("event/octeontx2: add Rx adapter")
Cc: stable@dpdk.org
Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>