dt-bindings: iio: temperature: ltc2983: remove qutations from phandle ref

Not needed, so why have them?

Signed-off-by: Cosmin Tanislav <cosmin.tanislav@analog.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20221103130041.2153295-5-demonsingur@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>