rocker: of_dpa: table tlv cleanup

There is a redundant information when both table id and nested info were
specified. Change this to remove all variants of nested info replacing
it with one generic. Also, push out table ids into header as this is
part of the api to the driver.

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Scott Feldman <sfeldma@cumulusnetworks.com>