staging: most: configfs: move configfs subsystems to container struct

This patch moves the declarations of the configfs subsystems to
a superordinate container structure. This is done to get access
to private subsystem data.

Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Link: https://lore.kernel.org/r/1573230068-27658-2-git-send-email-christian.gromm@microchip.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>