include: add sensors header file from AOSP

Taken from AOSP 4.1.2_r1

Signed-off-by: Simon Busch <morphis@gravedo.de>
tests: add simple test cases for sensors hardware module

Signed-off-by: Simon Busch <morphis@gravedo.de>
include: add lights API definition from AOSP

Signed-off-by: Simon Busch <morphis@gravedo.de>
hardware: lights: add convenience API method to open a lights device

Signed-off-by: Simon Busch <morphis@gravedo.de>
tests: add simple test case for hardware lights module

Signed-off-by: Simon Busch <morphis@gravedo.de>
hardware: rework light device open/close methods

Signed-off-by: Simon Busch <morphis@gravedo.de>
Merge pull request #6 from morphis/morphis/hardware-light-sensors-support

Morphis/hardware light sensors support