af-main: Allow service to run by default

af-main: Allow service to run by default

The previous settings assumed that services were
started by socket activation. This is not always
the case.

Change-Id: I9e8d6c7bdf961141964bb316e603018721a72054
Signed-off-by: José Bollo <jose.bollo@iot.bzh>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/10101
Tested-by: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-build: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>