board: st: Add support of STM32MP13x boards in stm32board cmd

Add board identifiers for STMicroelectronics STM32MP13x boards:
- DISCO board: MB1635

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