feat(stm32mp2-fdts): add sdmmc pins definition

Add the pins nodes for SD-card or eMMC. Those pins are used on
STM32MP257F-EV1 board.

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Change-Id: I96fe8210502b073bc222a70453bee1863a257c7b
1 file changed