am d2c68794: Merge changes I116424c4,Ibd0ef67f into eclair

Merge commit 'd2c68794364120d0531667e797f078416ebef3f5' into eclair-plus-aosp

* commit 'd2c68794364120d0531667e797f078416ebef3f5':
  Remove obsolete hardware auto-brightness support.
  Add documentation for proximity and light sensors.