iio: Directly use ida_alloc()/free()

Use ida_alloc()/ida_free() instead of deprecated
ida_simple_get()/ida_simple_remove() .

Signed-off-by: keliu <liuke94@huawei.com>
Link: https://lore.kernel.org/r/20220527091739.2949426-1-liuke94@huawei.com


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