tests: kernel: device: remove PM related tests

The PM subsystem is tested in tests/subsys/pm, the removed tests were
not relevant for devices. The test_build_suspend_device_list test has
been renamed to test_device_list since the API is not strictly related
to PM (and does not depend on it).

Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>