This patch add STM32MP1/MP13 HDP support. The Hardware Debug Port allows the observation of internal signals. By using multiplexers, up to 16 signals for each of 8-bit output can be observed. Signed-off-by: Christophe Roullier <christophe.roullier@st.com> Change-Id: I93d1ad52c28812af9654ea61e89d7a0faa626e24