dts: bindings: pwm: add Renesas R-Car PWM
dts: bindings: pwm: add Renesas R-Car PWM

This add the PWM can bindings for R-Car platforms.
Tested on Renesas Gen3 (h3).

Signed-off-by: Pierre Marzin <8d1ceff48eaf293acd03feaf542e477c8b8157d2@iot.bzh>

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