docs: add more driver-model infrastructure interfaces

Add bus, class, and device data structures and enum constants to the
Driver-Model Structures section and add function interfaces to the
Device Drivers Base section of the Device drivers infrastructure chapter.

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20230627064523.16618-1-rdunlap@infradead.org