iio: temperature: mlx90632 Style alignment for the driver

Changing and aligning the overall style of the driver with the recent
reviews. There is no functional change, only type generalization and
moving to the reverse Christmas tree for variable declarations.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Crt Mori <cmo@melexis.com>
Link: https://lore.kernel.org/r/d59aad00891c1a64e044a0f5bc7d40e42d47e9c7.1666606912.git.cmo@melexis.com


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>