staging: iio: resolver: Annotate Kconfig entries with module name information

This fixes the following checkpatch.pl warning:
WARNING: please write a paragraph that describes the config symbol fully

Signed-off-by: Roberta Dobrescu <roberta.dobrescu@gmail.com>
Acked-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/iio/resolver/Kconfig

@@ -10,6 +10,9 @@ config AD2S90
 	  Say yes here to build support for Analog Devices spi resolver
 	  to digital converters, ad2s90, provides direct access via sysfs.
 
+	  To compile this driver as a module, choose M here: the
+	  module will be called ad2s90.
+
 config AD2S1200
 	tristate "Analog Devices ad2s1200/ad2s1205 driver"
 	depends on SPI
@@ -19,6 +22,9 @@ config AD2S1200
 	  to digital converters, ad2s1200 and ad2s1205, provides direct access
 	  via sysfs.
 
+	  To compile this driver as a module, choose M here: the
+	  module will be called ad2s1200.
+
 config AD2S1210
 	tristate "Analog Devices ad2s1210 driver"
 	depends on SPI
@@ -27,4 +33,7 @@ config AD2S1210
 	  Say yes here to build support for Analog Devices spi resolver
 	  to digital converters, ad2s1210, provides direct access via sysfs.
 
+	  To compile this driver as a module, choose M here: the
+	  module will be called ad2s1210.
+
 endmenu