dts/arm: stm32: Add clocks nodes on stm32wb,l4 and stm32f4 series

Provided nodes reflect the clock tree of each series.
Clock nodes are disabled by default but populated with default
start up configuration. Main reason is the we don't want to
impact boards using Kconfig based clock configuration for now.
Exception to these rules:
- syslck: Default enabled, clock frequency and clock source not
provided
- pll: clock source not provided
This is made on purpose so that errors are triggered if parameters
essential to the board configuration are not provided.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>