dt-bindings: iio: imu: st_lsm6dsx: add lsm6ds3tr-c device bindings

Signed-off-by: NLorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/imu/st_lsm6dsx.txt

@@ -11,6 +11,7 @@ Required properties:
   "st,asm330lhh"
   "st,lsm6dsox"
   "st,lsm6dsr"
+  "st,lsm6ds3tr-c"
 - reg: i2c address of the sensor / spi cs line
 
 Optional properties: