agl-service-homescreen: use AGL_APP_REVISION as SRCREV

Switch agl-service-homescreen recipe to using AGL_APP_REVISION as its
SRCREV as all the other binding recipes do.

This change picks up commits:

89edd73 Fix CMake files and non-debug crashes
055909f Update autobuild script to create new targets

Bug-AGL: SPEC-2049, SPEC-3343

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: Ibb1b8b78f5dc15b73a81d51afe87082cd9796d9e
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/24676
Tested-by: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-build: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-boot-test: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>