Explicitly disable device runtime PM since this test is expecting
it to be disabled and there are SoC now that turns on it by default.
Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no>
The option CONFIG_NATIVE_UART_0_ON_STDINOUT
is only usable for the native_sim/posix(_64) targets,
but this test is only allowed for the nrf52840dk_nrf52840.
Building with this option set causes a kconfig warning.
Let's just remove it.
Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>
Added test which validates that uart device correctly handles
going to and from low power state.
Signed-off-by: Krzysztof Chruscinski <krzysztof.chruscinski@nordicsemi.no>
