iio:adc:max1363: Drop of_match_ptr and use generic device_get_match_data

Allows driver to use ACPI PRP0001 binding and there was no particular
advantage in having the protections in this driver.

Mostly this part of an effort to remove as many OF specific bits
of handling from IIO and use the generic forms where possible.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>