iio: tmag5273: Remove some unused field in struct tmag5273_data

In "struct tmag5273_data", the 'scale' and 'vcc' fields are unused.
Remove them.

Found with cppcheck, unusedStructMember.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Gerald Loacker <gerald.loacker@wolfvision.net>
Link: https://lore.kernel.org/r/7bd16d7fea12c64b6b3dc3cd32839cfce145bcf3.1714562912.git.christophe.jaillet@wanadoo.fr


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