dt-bindings: iio: temperature: ltc2983: drop $ref for -nanoamp properties

Currently there are -nanoamp properties both with and without a $ref.
dt-schema has been modified to handle it as a standard unit, but the
change has been reverted since there were still occurrences of
-nanoamp properties with a $ref.
Remove this since it's the only occurrence left.

Signed-off-by: Cosmin Tanislav <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

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