staging:iio:adis16400: Fix ADIS16334 temperature address

The channel spec for ADUS16334's temperature channel uses the address and scan
index for the Z-axis acceleration channel. This patch fixes it to use the
temperature channel address and scan index instead.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>