Add a simple API to allow getting the monitor conditions for
power-optimized monitoring of the Rx queues from the PMD, as well as
release notes information.

Signed-off-by: Liang Ma <redacted>
Signed-off-by: Anatoly Burakov <redacted>
Acked-by: Andrew Rybchenko <redacted>
---

Notes:
    v13:
    - Fix typos and issues raised by Andrew

 doc/guides/rel_notes/release_21_02.rst |  5 +++++
 lib/librte_ethdev/rte_ethdev.c         | 28 ++++++++++++++++++++++++++
 lib/librte_ethdev/rte_ethdev.h         | 25 +++++++++++++++++++++++
 lib/librte_ethdev/rte_ethdev_driver.h  | 22 ++++++++++++++++++++
 lib/librte_ethdev/version.map          |  3 +++
 5 files changed, 83 insertions(+)
--

Acked-by: Konstantin Ananyev <redacted>

2.25.1