kuksa-val: Upgrade to latest

Changes:
- Upgrade kuksa-val and kuksa-viss-client to a commit that includes
  the 0.2.5 release tag and some fixes past it.  The patches for each
  have been updated against the newer version, with backported ones
  dropped.
- The affected recipes have been updated to include some new gRPC
  tooling dependencies, and a recipe for a new jsonpath-ng dependency
  has been added.
- Rework the kuksa-dbc-feeder recipe for the splitting out of the
  example feeders from the main kuksa-val repository.
- Rework our local kuksa-dbc-feeder patches against the newer version,
  as upstream has made several improvements.  Also drop the duplicate
  filtering feature patch, as it seems likely we will not need it
  going forward.
- Update the kuksa-dbc-feeder configuration files to work with the new
  version.  Notable is a change in the engine speed signal naming in
  VSS 3.0, which is the new default for VSS schema.
- The kuksa-val and kuksa-val-feeders trees have changed their
  licensing from EPL-1.0 to Apache-2.0, update the recipes
  accordingly.

Bug-AGL: SPEC-4587

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: Ibc990767219f79af95929e86361e66beda2d0c9e
(cherry picked from commit 54ef381ec92148015cbd743a1b30771cca22f80b)