Add explicit applaunchd systemd dependencies

While the change to ensure polkit starts before applaunchd in
meta-app-framework should resolve the observed failures, it is also
the case that the applications here that call into the applaunchd
API did not have dependencies on it in their systemd units, so also
fix that to improve overall robustness.

Bug-AGL: SPEC-4840

Change-Id: I884b7b326309a0dbdc374a93929aa33f421c680c
Signed-off-by: Scott Murray <scott.murray@konsulko.com>