dts: bindings: clock: add fixed-factor-clock binding
dts: bindings: clock: add fixed-factor-clock binding

Allows for adding in fixed factor clock that are derived
from a parent clock.

Based on:
https://git.kernel.org/pub/scm/linux/kernel/git/devicetree/devicetree-rebasing.git/tree/Bindings/clock/fixed-factor-clock.yaml

Signed-off-by: Mikkel Jakobsen <31215e1a25e10d3f738438d78f8193ee267dd757@prevas.dk>

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