MAINTAINERS: add entry for ltc1660 DAC driver

Add entry for ltc1660 DAC driver and add myself as
maintainer of this driver.
Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

MAINTAINERS

@@ -8490,6 +8490,13 @@ L:	linux-scsi@vger.kernel.org
 S:	Maintained
 F:	drivers/scsi/sym53c8xx_2/
 
+LTC1660 DAC DRIVER
+M:	Marcus Folkesson <marcus.folkesson@gmail.com>
+L:	linux-iio@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/iio/dac/ltc1660.txt
+F:	drivers/iio/dac/ltc1660.c
+
 LTC4261 HARDWARE MONITOR DRIVER
 M:	Guenter Roeck <linux@roeck-us.net>
 L:	linux-hwmon@vger.kernel.org