scripts: compliance: add devicetree binding compliance check
scripts: compliance: add devicetree binding compliance check

Add `DevicetreeBindingsCheck` and `required_false_check()`, which
checks to make sure that no new Devicetree bindings add the
redundant `required: false` property.

Signed-off-by: Chris Friedt <b335fc22cf1358c7e834a5788f93b9f24396b889@meta.com>

zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr