This reverts commit a3fad2e9.

The core components of the subsystem no longer assume that low-level
modules register a driver for the parent device and rely on its owner
pointer to take the module's refcount. KUnit test suites can now be safely
re-enabled with loadable module support.
Signed-off-by: Marco Pagani <marpagan@redhat.com>
Acked-by: Xu Yilun <yilun.xu@intel.com>
Link: https://lore.kernel.org/r/20240604102536.59010-1-marpagan@redhat.comSigned-off-by: Xu Yilun <yilun.xu@linux.intel.com>