configs: stm32mp25: add bootcmd for stm32mp25 platform

Handle boot for the 3 instance of MMC and call the command stm32prog
for serial boot on USB or on UART as it is done for other STM32MP platform.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
1 file changed