hwmon: Move the IIO client driver for hwmon out of staging

This driver uses channel maps, defined either through device tree
or platform data, to create a hwmon driver which acts as a client
for the underlying IIO device channels.  Thus a general purpose
IIO adc driver can be used to provide hardware monitoring using a subset
of its channels.

Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Acked-by: Guenter Roeck <linux@roeck-us.net>

--
 The only non move changes here concern the description and changes to the
 dependencies to IIO explicit and hwmon implicit.

 I'm proposing moving this into hwmon on the basis of placing drivers
 based on what they provide rather than what their underlying hardware
 is.

 drivers/hwmon/Kconfig           |   9 ++
 drivers/hwmon/Makefile          |   1 +
 drivers/hwmon/iio_hwmon.c       | 196 ++++++++++++++++++++++++++++++++++++++++
 drivers/staging/iio/Kconfig     |   8 --
 drivers/staging/iio/Makefile    |   2 -
 drivers/staging/iio/iio_hwmon.c | 196 ----------------------------------------
 6 files changed, 206 insertions(+), 206 deletions(-)
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 89ac1cb..effbd11 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -499,6 +499,15 @@
 	  This driver can also be built as a module.  If so, the module
 	  will be called ibmpex.
 
+config SENSORS_IIO_HWMON
+	tristate "Hwmon driver that uses channels specified via iio maps"
+	depends on IIO
+	help
+	  This is a platform driver that in combination with a suitable
+	  map allows IIO devices to provide basic hwmon functionality
+	  for those channels specified in the map.  This map can be provided
+	  either via platform data or the device tree bindings.
+
 config SENSORS_IT87
 	tristate "ITE IT87xx and compatibles"
 	depends on !PPC