iio: sca3000: simplify with spi_get_device_match_data()

iio: sca3000: simplify with spi_get_device_match_data()

Refactor each sca3000 variant with it's own chip_info struct, update the
sca3000_probe() to use spi_get_device_match_data().

Suggested-by: David Lechner <dlechner@baylibre.com>
Suggested-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>