counter: 104-quad-8: Implement and utilize register structures

counter: 104-quad-8: Implement and utilize register structures

Reduce magic numbers and improve code readability by implementing and
utilizing named register data structures.

Link: https://lore.kernel.org/r/20220707171709.36010-1-william.gray@linaro.org/
Cc: Syed Nayyar Waris <syednwaris@gmail.com>
Tested-by: Fred Eckert <Frede@cmslaser.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
Link: https://lore.kernel.org/r/285fdc7c03892251f50bdbf2c28c19998243a6a3.1657813472.git.william.gray@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>