libsensors: HAL layer for light sensors

A HAL layer for libals compatible light sensors
is implemented.

Signed-off-by: Stefan Karlsson <stefan3.karlsson@sonymobile.com>
Signed-off-by: Oskar Andero <oskar.andero@sonymobile.com>
Add sensor configuration files for Xperia T

Signed-off-by: Oskar Andero <oskar.andero@sonymobile.com>