include/dt-bindings/clock: stm32: Add clock sources bindings

Add clock sources bindings on F0/F3/G0/G4/L0/L1/L4/WB/WL series.
Due to inconsistencies, some common bindings are now split:
F1 -> F0/F1/F3
L4 -> L4/G4/WB
Update .dtsi files when required

In a first step, allowed sources are limited to already supported
clocks: LSI/LSE/HSI/HSE/MSI/PCLK/PLLCLK/SYSCLK
Support for other clocks such as HSI48, SAIXCLK, ... is left for a
next step.

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