HID: sensor-hub: get rid of unused sensor_hub_grabbed_usages[] table

This table is not used anywhere in the driver so kill it.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>