Enable the sample to run on stm32h750b-dk board with async UART backend Signed-off-by: Abderrahmane JARMOUNI <git@jarmouni.me>
Added board specific configuration which enables use of asynchronous UART API in UART log backend. Signed-off-by: Krzysztof Chruscinski <krzysztof.chruscinski@nordicsemi.no>