dt-bindings: iio/adc: ti,palmas-gpadc: Drop incomplete example

dt-bindings: iio/adc: ti,palmas-gpadc: Drop incomplete example

The example for the TI Palmas ADC is incomplete as the binding is the
full PMIC, not just the sub-functions. It is preferred for MFD examples
to be complete in the top-level MFD device binding rather than piecemeal
in each sub-function binding.

This also fixes an undocumented (by schema) compatible warning for
'"ti,twl6035-pmic", "ti,palmas-pmic"'.

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20231128214803.3975542-1-robh@kernel.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>