STPK-1429 Document usage of sensor properties
STPK-1429 Document usage of sensor properties

Let's document the properties we support.

Issue: STPK-1429

Change-Id: I07704c2e17eacad29ea373bba96e9c78ebadd8f6
Signed-off-by: Patrick Porlan <6b7a5b9114e07d350ffba0c179039885a7e82794@intel.com>

01org/android-iio-sensors-hal,01org/android-iio-sensors-hal