AMD SFH driver results in orientation undefined (HP Envy x360)

Refs #275 (closed) which was closed as the driver wasn't yet available.

The driver (amd_sfh) has landed in the 5.11 kernel but iio is still not working with the HP Envy x360. It can detect the accelerometer but not it's orientation

monitor-sensor gives the following output:

+++ iio-sensor-proxy appeared
=== Has accelerometer (orientation: undefined)
=== No ambient light sensor
=== No proximity sensor

Edit: s/working/not working/