bat.d driver: Framework laptops

* Requires framework_laptop kernel module (currently out-of-tree)
* Stop threshold only
* Force discharge not supported

* Requires Framework Laptop 13/16 Intel/AMD

* charge_control_end_threshold:
  - Valid values: 1..100
  - Default value: 100

Credits:
* #728

Reference:
* https://github.com/DHowett/framework-laptop-kmod/tree/main