counter: 104-quad-8: Add const qualifiers for quad8_preset_register_set

Add some safety by qualifying the quad8_preset_register_set() function
parameters as const.

Acked-by: Syed Nayyar Waris <syednwaris@gmail.com>
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Link: https://lore.kernel.org/r/050f1b518eeae8e3683f7d6d11f3219a137adf48.1623201081.git.vilhelm.gray@gmail.com


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>