linux_kselftest-kunit-6.8-rc1

This KUnit update for Linux 6.8-rc1 consists of:

- a new feature that adds APIs for managing devices introducing
  a set of helper functions which allow devices (internally a
  struct kunit_device) to be created and managed by KUnit.
  These devices will be automatically unregistered on
  test exit. These helpers can either use a user-provided
  struct device_driver, or have one automatically created and
  managed by KUnit. In both cases, the device lives on a new
  kunit_bus.

- changes to switch drm/tests to use kunit devices

- several fixes and enhancements to attribute feature

- changes to reorganize deferred action function introducing
  KUNIT_DEFINE_ACTION_WRAPPER

- new feature adds ability to run tests after boot using debugfs

- fixes and enhancements to string-stream-test:
  - parse ERR_PTR in string_stream_destroy()
  - unchecked dereference in bug fix in debugfs_print_results()
  - handling errors from alloc_string_stream()
  - NULL-dereference bug fix in kunit_init_suite()
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