dts: arm st: u5: Enable PWM support for stm32U5 in dtsi
dts: arm st: u5: Enable PWM support for stm32U5 in dtsi

add PWM support in dtsi for stm32U5. Adding timer nodes for different
PWM capability.

Signed-off-by: TLIG Dhaou <40d2d47ed8a47b1cc9b5cd3b9c7a8a166e6f53e5@st.com>

zephyrproject-rtos/zephyr,finikorg/zephyr,finikorg/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr