agl-demo-control-panel: Update SRCREV

agl-demo-control-panel: Update SRCREV

Update SRCREV to get:

f9aef30 agl-demo-control-panel: Improve gRPC Mode

Bug-AGL: SPEC-4905, SPEC-4952

Change-Id: Ic3fde5793ad3f122ecdfdd4a340cab7f67b522ba
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl-demo/+/29386
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Tested-by: Jenkins Job builder account
ci-image-boot-test: Jenkins Job builder account
ci-image-build: Jenkins Job builder account