am 6897e36b: Add comment warning to not use hardware based autobrightness support.

Merge commit '6897e36b894b2a10fd8b2e3af6587b5f789fde72' into eclair-plus-aosp

* commit '6897e36b894b2a10fd8b2e3af6587b5f789fde72':
  Add comment warning to not use hardware based autobrightness support.