dt-bindings: stm32mp13: add clock & reset support for STM32MP13

Add support of stm32mp13 DT bindings of clock and reset.

Signed-off-by: Gabriel Fernandez <gabriel.fernandez@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>