native_posix is now deprecated.
Building these tests in both native_sim and native_posix does not
improve coverage for the tests or subsystem but doubles CI time.
As anyhow native_posix will be removed all together in
2 releases, let's remove it already for these.
Note: Some drivers tests for which there is native specific driver
which will or may be built differently in native_sim and native_posix
have been left enabled for native_posix
Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>
081c3638e1