flutter-ics-homescreen: update SRCREV

flutter-ics-homescreen: update SRCREV

Update SRCREV to pick up:

71d46d0 More signaling fixes

Bug-AGL: SPEC-4999

Change-Id: I9bf1fe37bff1ec2675717d59ec40abca55aa25f7
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl-demo/+/29526
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
ci-image-boot-test: Jenkins Job builder account
Reviewed-by: Naoto YAMAGUCHI <naoto.yamaguchi@aisin.co.jp>
ci-image-build: Jenkins Job builder account
Tested-by: Jenkins Job builder account