hwmon: (hdaps) Allow inversion of separate axis

Fix for kernel.org bug #7154: hdaps inversion of each axis. This
version is based on the work from Michael Ruoss <miruoss@student.ethz.ch>.

Signed-off-by: Frank Seidel <frank@f-seidel.de>
Signed-off-by: Jean Delvare <khali@linux-fr.org>