sensor: Remove dead code from header

This accidentally snuck by between iterations of the workqueue patches.
In v1 there was a sensor-specific workqueue, which we then turned into a
global one.

Change-Id: I10b193bb535602a16f6742d057281ba01906228d
Signed-off-by: Vlad Dogaru <vlad.dogaru@intel.com>
1 file changed