dt-bindings: iio: adc: Remove the property "aspeed,trim-data-valid"

If the property is set on a device without valid trimming data in the OTP
the ADC will not function correctly. Therefore, this patch drops the use
of this property to avoid this scenario.

Fixes: 2bdb2f00 ("dt-bindings: iio: adc: Add ast2600-adc bindings")
Signed-off-by: NBilly Tsai <billy_tsai@aspeedtech.com>
Acked-by: NRob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20221114025057.10843-2-billy_tsai@aspeedtech.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/adc/aspeed,ast2600-adc.yaml

@@ -62,13 +62,6 @@ properties:
     description:
       Inform the driver that last channel will be used to sensor battery.
 
-  aspeed,trim-data-valid:
-    type: boolean
-    description: |
-      The ADC reference voltage can be calibrated to obtain the trimming
-      data which will be stored in otp. This property informs the driver that
-      the data store in the otp is valid.
-
 required:
   - compatible
   - reg