iio: frequency: Kconfig: AD9783 select REGMAP_SPI

The driver uses regmap spi modpost symbols such as devm_regmap_init_spi.

Signed-off-by: Jorge Marques <jorge.marques@analog.com>

Author: gastmaier

drivers/iio/frequency/Kconfig

@@ -147,6 +147,7 @@ config CF_AXI_DDS_AD9172
 config CF_AXI_DDS_AD9783
 	tristate "Analog Devices AD9783 DAC"
 	depends on CF_AXI_DDS
+	select REGMAP_SPI
 	help
 	  Say yes here to build support for Analog Devices AD9783 DAC family,
 	  provides direct access via sysfs.