tests: drivers: uart: async_api: Align test to gcov

When CONFIG_COVERAGE is enabled then performance is degraded.
In that case higher baudrates shall be avoided because CPU may
not have enough time to handle UART interrupts. Limit baudrate
to 115200 when CONFIG_COVERAGE=y.

Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no>
1 file changed