sensor: add driver for LPS25HB

Add driver for LPS25HB pressure and temperature sensor.

Datasheet:
http://www.st.com/content/ccc/resource/technical/document/datasheet/9a/4c/aa/72/1f/45/4e/24/DM00141379.pdf/files/DM00141379.pdf/jcr:content/translations/en.DM00141379.pdf



Change-Id: I6b616e879777b52f16f4e867c330e8beacf59fd3
Signed-off-by: Murtaza Alexandru <alexandru.murtaza@intel.com>
Signed-off-by: Bogdan Davidoaia <bogdan.m.davidoaia@intel.com>