flutter-ics-homescreen: update SRCREV

Update SRCREV to pick up:

dca5f5b VSS signal fixes
b9377be Update HVAC fan.
8558b64 Refactor: Dispaly user name

Bug-AGL: SPEC-4971, SPEC-4999

Change-Id: I8b296688f2232f4e09fc8f6e0260e0459f9e7268
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl-demo/+/29508
Tested-by: Jenkins Job builder account
ci-image-build: Jenkins Job builder account
ci-image-boot-test: Jenkins Job builder account
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>