staging:iio:adis16400: Fix ADIS16300 temperature address

The ADIS16300 uses the same address for the temperature register as the
ADIS16350 and not the same as the ADIS16400.

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>