iio:ad5064: List support LTC devices in Kconfig

List the newly support LTC devices in the Kconfig entry for the AD5064
driver.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/dac/Kconfig

@@ -11,7 +11,8 @@ config AD5064
 	help
 	  Say yes here to build support for Analog Devices AD5024, AD5025, AD5044,
 	  AD5045, AD5064, AD5064-1, AD5065, AD5628, AD5629R, AD5648, AD5666, AD5668,
-	  AD5669R Digital to Analog Converter.
+	  AD5669R, LTC2606, LTC2607, LTC2609, LTC2616, LTC2617, LTC2619, LTC2626,
+	  LTC2627, LTC2629 Digital to Analog Converter.
 
 	  To compile this driver as a module, choose M here: the
 	  module will be called ad5064.