configs: add stm32mp13 defconfig

Add a initial config for STM32M13x SOC family, using the stm32mp135f-dk
device tree.

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