iio:dac:ad5504 replaces IIO_ST macro with explicit entries to struct scan_type

IIO_ST is going away as it is a pain to maintain.

Signed-off-by: Jonathan Cameron <[e-mail]>
Acked-by: Lars-Peter Clausen <[e-mail]>

drivers/iio/dac/ad5504.c

···
 	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
 	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
 	.address = AD5504_ADDR_DAC(_chan), \
-	.scan_type = IIO_ST('u', 12, 16, 0), \
+	.scan_type = { \
+		.sign = 'u', \
+		.realbits = 12, \
+		.storagebits = 16, \
+	}, \
 	.ext_info = ad5504_ext_info, \
 }