staging: most: core: remove sysfs attr remove_link

This patch removes the sysfs attribute remove_link, as it is not needed
anymore since the introduction of the configfs configuration interface.

Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Link: https://lore.kernel.org/r/1574258738-12863-1-git-send-email-christian.gromm@microchip.com


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