One of the test case is performing long transfers using 1k buffers.
For some targets there may be not enough RAM to perform such
transfers. Make long buffer length configurable.
Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no>
Add support for running tests with DCache enabled & put DMA buffers
in a nocache memory region to avoid coherency issues.
Signed-off-by: Abderrahmane Jarmouni <abderrahmane.jarmouni-ext@st.com>