Dorregaray: Add Gyroscope sensor userspace driver

Based on the hardware/invensense/libsensors/ example

Requires:
http://review.cyanogenmod.org/#/c/29733/

1. Introduce MPL3050 userspace driver
2. Updates to sensor setup by John Newby

Change-Id: I4ae4017727b88dff4c8206c7702f4a4c0861f75d

Conflicts:

	libsensors/MPLSensor.cpp