Update VSS engine speed signal user SRCREVs

Update VSS engine speed signal user SRCREVs

Update the SRCREVs of the following applications that use the VSS
engine speed signal to pick up their fixes for the signal data type
being corrected in our VSS overlays:

- flutter-ics-homescreen
- flutter-cluster-dashboard
- dashboard
- cluster-dashboard

Bug-AGL: SPEC-5204

Change-Id: I7fe1a4da9b6994494fe1a855d4b0025ee3ce9c64
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl-demo/+/30219
ci-image-boot-test: Jenkins Job builder account
Tested-by: Jenkins Job builder account
ci-image-build: Jenkins Job builder account