aktualizr-lite: Simplify CMakeFile
aktualizr-lite: Simplify CMakeFile

We don't really need this custom target. This makes just running a
unit test on aktualizr-lite a little slower, but nothing major.

Signed-off-by: Andy Doan <e3579b1e47f273529f0f929453e939a68ede9fd1@foundries.io>

advancedtelematic/sota_client_cpp,advancedtelematic/aktualizr,advancedtelematic/aktualizr,advancedtelematic/aktualizr,advancedtelematic/aktualizr,advancedtelematic/sota_client_cpp