staging: most: configfs: reduce array size

This patch reduces the size of the arrays inside the mdev_link struct to
a reasonable value.

Reported-by: Joe Perches <joe@perches.com>
Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Link: https://lore.kernel.org/r/1576238662-16512-6-git-send-email-christian.gromm@microchip.com


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