staging: most: Documentation: update driver documentation

This patch updates the driver documentation files to reflect the
latest changes regarding configfs.

Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
v2:
	- changed kernel version to 5.2
v3:
v4:

Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>