dts: stm32l4r5: Add extra timer nodes not present in parent
dts: stm32l4r5: Add extra timer nodes not present in parent

Add timer nodes that aren't present in the parent file. Adds timers 3,
4, 5, 8, 17.

Signed-off-by: Pushpal Sidhu <1bbf91bdb66f74b1ab0901158947c9d4636ee766@gmail.com>

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