net: prestera: add counter HW API

Add counter API for getting HW statistics.

- HW statistics gathered by this API are deleyed.
- Batch of conters is supported.
- acl stat is supported.

Co-developed-by: Serhiy Boiko <serhiy.boiko@marvell.com>
Signed-off-by: Serhiy Boiko <serhiy.boiko@marvell.com>
Signed-off-by: Volodymyr Mytnyk <vmytnyk@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>