iio: accel: kx022a: convert to use maple tree register cache

iio: accel: kx022a: convert to use maple tree register cache

The maple tree register cache is based on a much more modern data structure
than the rbtree cache and makes optimisation choices which are probably
more appropriate for modern systems than those made by the rbtree cache.

Signed-off-by: Bo Liu <liubo03@inspur.com>
Acked-by: Matti Vaittinen <mazziesaccount@gmail.com>
Link: https://patch.msgid.link/20250212075223.4164-5-liubo03@inspur.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>