iio: temperature: max31865: Make use of device properties

Convert the module to be property provider agnostic and allow
it to be used on non-OF platforms.

Add mod_devicetable.h include.

Signed-off-by: Andy Shevchenko <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/temperature/max31865.c

···
 #include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/init.h>
+#include <linux/mod_devicetable.h>
 #include <linux/module.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
+#include <linux/property.h>
 #include <linux/spi/spi.h>
 #include <asm/unaligned.h>
 
···
 	indio_dev->channels = max31865_channels;
 	indio_dev->num_channels = ARRAY_SIZE(max31865_channels);
 
-	if (of_property_read_bool(spi->dev.of_node, "maxim,3-wire")) {
+	if (device_property_read_bool(&spi->dev, "maxim,3-wire")) {
 		/* select 3 wire */
 		data->three_wire = 1;
 	} else {