sensor: add driver for LIS3DH accelerometer

Add device driver for the LIS3DH I2C-based triaxial accelerometer
sensor, which supports reading data from the accel-x, accel-y and
accel-z channels.

Datasheet:
	http://www.st.com/web/en/resource/technical/document/datasheet/CD00274221.pdf

Application note:
	http://www.st.com/web/en/resource/technical/document/application_note/CD00290365.pdf



Change-Id: Ib51bd6346798249d850376e50d1c938eda8a3d28
Signed-off-by: Bogdan Davidoaia <bogdan.m.davidoaia@intel.com>