kuksa-val: remove deprecated KUKSA.val server

Remove recipes for deprecated KUKSA.val C++ based server and
associated configuration.  It is no longer supported by upstream,
and has not been used in the demo images for multiple releases.

Bug-AGL: SPEC-5179

Change-Id: I339dc62df667650a5025e58d6f8272b040ef393d
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl-demo/+/29999
ci-image-boot-test: Jenkins Job builder account
Tested-by: Jenkins Job builder account
ci-image-build: Jenkins Job builder account