flutter-hvac: update SRCREV

Update flutter-hvac SRCREV to pick up KUKSA.val databroker gRPC API
changes, update its YAML configuration file to match, and add the
JWT authorization token the configuration requires.

Bug-AGL: SPEC-4762

Change-Id: If272680063afb3d286f1f709dcc59c40c58f858a
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl-demo/+/29238
Tested-by: Jenkins Job builder account
ci-image-build: Jenkins Job builder account
ci-image-boot-test: Jenkins Job builder account