clk: stm32mp13: introduce STM32MP13 RCC driver

clk: stm32mp13: introduce STM32MP13 RCC driver

STM32MP13 RCC driver uses Common Clock Framework and also a
'clk-stm32-core' API. Then STM32MPx RCC driver will contain only data
configuration (gates, mux, dividers and the way to check security)
or some specific clocks.
This API will be used by all new other generations of ST Socs.

Signed-off-by: Gabriel Fernandez <gabriel.fernandez@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Sean Anderson <seanga2@gmail.com>
Tested-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>