ARM: dts: stm32: populate all timer counter nodes on stm32mp15

Counter driver originally had support limited to quadrature interface
and simple counter. It has been improved[1], so add the remaining
stm32 timer counter nodes.

[1] https://lore.kernel.org/linux-arm-kernel/20240307133306.383045-1-fabrice.gasnier@foss.st.com/



Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>