staging: most: Documentation: move ABI description files out of staging area

This patch moves the ABI description fils sysfs-bus-most and
configfs-most to the kernel's documentation folder.

Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Link: https://lore.kernel.org/r/1583845362-26707-4-git-send-email-christian.gromm@microchip.com


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