Update the existing load API to introduce a "load owner" concept.

This allows the tracking of the loaded configurations and features against
the loading owner type, to allow later unload according to owner.

A list of loaded configurations by owner is created.

The load owner infrastructure will be used in following patches
to implement dynanic load and unload, alongside dependency tracking.
Signed-off-by: Mike Leach <mike.leach@linaro.org>
Link: https://lore.kernel.org/r/20211124200038.28662-2-mike.leach@linaro.orgSigned-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>