eventdev: extend capability flags

eventdev: extend capability flags

add new capability flags to express the opdl PMD limitations.

RTE_EVENT_DEV_CAP_NONSEQ_MODE

Event device is capable of operating in none sequential mode. The path
of the event is not necessary to be sequential. Application can change
the path of event at runtime. If the flag is not set, then event each event
will follow a path from queue 0 to queue 1 to queue 2 etc. If the flag is
set, events may be sent to queues in any order. If the flag is not set, the
eventdev will return an error when the application enqueues an event for a
qid which is not the next in the sequence.

RTE_EVENT_DEV_CAP_RUNTIME_PORT_LINK

Event device is capable of configuring the queue/port link at runtime.
If the flag is not set, the eventdev queue/port link is only can be
configured during  initialization.

RTE_EVENT_DEV_CAP_MULTIPLE_QUEUE_PORT

Event device is capable of setting up the link between multiple queue
with single port. If the flag is not set, the eventdev can only map a
single queue to each port or map a single queue to many port.

Signed-off-by: Liang Ma <liang.j.ma@intel.com>
Signed-off-by: Peter Mccarthy <peter.mccarthy@intel.com>
Acked-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>