flutter-homescreen: update SRCREV

Update flutter-homescreen 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, SPEC-4903

Change-Id: I230f77aa120d76af928990bd2b7b1d8eacdcaaaa
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl-demo/+/29230
Tested-by: Jenkins Job builder account
ci-image-build: Jenkins Job builder account
ci-image-boot-test: Jenkins Job builder account