The STM32MP157 SoC series includes 3 instances of the SDMMC peripheral.
The sdmmc2 and sdmmc3 nodes are added in STM32MP157 SoC DT file.
Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
Signed-off-by: Yann Gautier <yann.gautier@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>