Use new agl-kuksa-val feature

Use new agl-kuksa-val feature

Update agl-demo and agl-demo-control-panel feature definitions to use
new agl-kuksa-val feature instead of pulling in meta-agl-kuksa-val
directly.

Bug-AGL: SPEC-5299

Change-Id: I059bfa86eb7725aa24f366ea781691db018238aa
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl-demo/+/30537
ci-image-build: Jenkins Job builder account
Tested-by: Jenkins Job builder account
ci-image-boot-test: Jenkins Job builder account