dt-bindings: iio: temperature: melexis,mlx90614: Document MLX90615 support

Document support for MLX90615 Infra Red Thermometer, which seems to
be the predecesor of MLX90614 . There are significant differences in
the register layout compared to MLX90614, but the functionality of
the device is virtually identical.
Acked-by: Crt Mori <cmo@melexis.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Marek Vasut <marex@denx.de>
Link: https://lore.kernel.org/r/20230510102251.10118-1-marex@denx.deSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/temperature/melexis,mlx90614.yaml

@@ -4,7 +4,7 @@
 $id: http://devicetree.org/schemas/iio/temperature/melexis,mlx90614.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: Melexis MLX90614 contactless IR temperature sensor
+title: Melexis MLX90614/MLX90615 contactless IR temperature sensor
 
 maintainers:
   - Peter Meerwald <pmeerw@pmeerw.net>
@@ -15,7 +15,9 @@ description: |
 
 properties:
   compatible:
-    const: melexis,mlx90614
+    enum:
+      - melexis,mlx90614
+      - melexis,mlx90615
 
   reg:
     maxItems: 1