staging:iio: Add an iio channel type string to support proximity sensors.

Add "proximity" to the iio_chan_type_name_spec_shared string list to
support proximity sensors.
Now this list fully matches the declared iio_chan_type enums.
Signed-off-by: Bryan Freed <bfreed@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/industrialio-core.c

@@ -54,6 +54,7 @@ static const char * const iio_chan_type_name_spec_shared[] = {
 	[IIO_MAGN] = "magn",
 	[IIO_LIGHT] = "illuminance",
 	[IIO_INTENSITY] = "intensity",
+	[IIO_PROXIMITY] = "proximity",
 	[IIO_TEMP] = "temp",
 	[IIO_INCLI] = "incli",
 	[IIO_ROT] = "rot",