Revert "UBUNTU: SAUCE: (no-up) iio: st_pressure: st_accel: Initialise sensor platform data properly"

BugLink: http://bugs.launchpad.net/bugs/1764762

This reverts commit 4fe0a67f to be
replaced by the upstream version from 4.4.124.
Signed-off-by: Juerg Haefliger <juergh@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>