staging: iio: adc: ad7606: Simplify the Kconfing menu

There is no point in having three menu entries that can be selected
individually. Instead, the SPI and parallel interfaces should select
AD7606.
Signed-off-by: Stefan Popa <stefan.popa@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/staging/iio/adc/Kconfig

@@ -4,35 +4,28 @@
 menu "Analog to digital converters"
 
 config AD7606
-	tristate "Analog Devices AD7606 ADC driver"
-	depends on GPIOLIB || COMPILE_TEST
-	depends on HAS_IOMEM
+	tristate
 	select IIO_BUFFER
 	select IIO_TRIGGERED_BUFFER
-	help
-	  Say yes here to build support for Analog Devices:
-	  ad7605-4, ad7606, ad7606-6, ad7606-4 analog to digital converters (ADC).
-
-	  To compile this driver as a module, choose M here: the
-	  module will be called ad7606.
 
 config AD7606_IFACE_PARALLEL
-	tristate "parallel interface support"
-	depends on AD7606
+	tristate "Analog Devices AD7606 ADC driver with parallel interface support"
+	depends on HAS_IOMEM
+	select AD7606
 	help
-	  Say yes here to include parallel interface support on the AD7606
-	  ADC driver.
+	  Say yes here to build parallel interface support for Analog Devices:
+	  ad7605-4, ad7606, ad7606-6, ad7606-4 analog to digital converters (ADC).
 
 	  To compile this driver as a module, choose M here: the
 	  module will be called ad7606_parallel.
 
 config AD7606_IFACE_SPI
-	tristate "spi interface support"
-	depends on AD7606
+	tristate "Analog Devices AD7606 ADC driver with spi interface support"
 	depends on SPI
+	select AD7606
 	help
-	  Say yes here to include parallel interface support on the AD7606
-	  ADC driver.
+	  Say yes here to build spi interface support for Analog Devices:
+	  ad7605-4, ad7606, ad7606-6, ad7606-4 analog to digital converters (ADC).
 
 	  To compile this driver as a module, choose M here: the
 	  module will be called ad7606_spi.