This migrates the subsys code samples to the new Sphinx code-sample
extension, making it easier to find relevant samples when browsing
API reference.
Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>
Move last remaining items from reference section to the appropriate new
section in the new structure.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>