This commit removes the redundant `LOG` and `LOG_IMMEDIATE` selections
in `prj.conf`, since the `TEST_LOGGING_DEFAULTS`, which is enabled by
default for all tests, selects `LOG` and `LOG_MINIMAL`.
This effectively allows the test to run with the default test logging
policy, set by the testing subsystem.
Signed-off-by: Stephanos Ioannidis <root@stephanos.io>
Port all users of 'set_conf_file' to use the built-in rules
instead. This follows the convention-over-configuration principle to
make the system as a whole simpler and more consistent.
Signed-off-by: Sebastian Bøe <sebastian.boe@nordicsemi.no>