iio: accel: kxcjk-1013: Get rid of enum kx_chipset

Instead of using enum, out of which only a couple of values
are being actually used, make a comparisons against pointer
to the respective chip_info structures.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20241024191200.229894-15-andriy.shevchenko@linux.intel.com


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