Documentation: iio: Remove location attribute

The cros-ec specific |location| attribute has been superseded by the
generic |label| attribute.

Signed-off-by: Gwendal Grignou <[e-mail]>
Signed-off-by: Jonathan Cameron <[e-mail]>

Documentation/ABI/testing/sysfs-bus-iio-cros-ec

···
                 corresponding calibration offsets can be read from `*_calibbias`
                 entries.
 
-What:		/sys/bus/iio/devices/iio:deviceX/location
-Date:		July 2015
-KernelVersion:	4.7
-Contact:	[e-mail]
-Description:
-		This attribute returns a string with the physical location where
-                the motion sensor is placed. For example, in a laptop a motion
-                sensor can be located on the base or on the lid. Current valid
-		values are 'base' and 'lid'.
-
 What:		/sys/bus/iio/devices/iio:deviceX/id
 Date:		September 2017
 KernelVersion:	4.14