dt-bindings: add Delta AHE-50DC fan control module

This is the integrated fan control module of the Delta AHE-50DC Open19
power shelf.

Signed-off-by: Zev Weiss <zev@bewilderbeest.net>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211208213703.2577-3-zev@bewilderbeest.net
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Author: zevweiss

Documentation/devicetree/bindings/trivial-devices.yaml

@@ -73,6 +73,8 @@ properties:
           - dallas,ds4510
             # Digital Thermometer and Thermostat
           - dallas,ds75
+            # Delta AHE-50DC Open19 power shelf fan control module
+          - delta,ahe50dc-fan
             # Delta Electronics DPS-650-AB power supply
           - delta,dps650ab
           # Delta Electronics DPS920AB 920W 54V Power Supply