dt-bindings: trivial-devices: Drop duplicate "maxim,max1237"

"maxim,max1237" is already documented in iio/adc/maxim,max1238.yaml, so
drop it from trivial-devices.yaml.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Rob Herring (Arm) <[email protected]>

Author: robherring

Documentation/devicetree/bindings/trivial-devices.yaml

@@ -179,8 +179,6 @@ properties:
           - maxim,ds1803-100
             # 10 kOhm digital potentiometer with I2C interface
           - maxim,ds3502
-            # Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs
-          - maxim,max1237
             # Temperature Sensor, I2C interface
           - maxim,max1619
             # 3-Channel Remote Temperature Sensor