am aa66ea88: Use separate flags for enabling hardware and software auto-brightness.

Merge commit 'aa66ea880f58c9caa49e31c166bb3bd6bbf14e21' into eclair-mr2

* commit 'aa66ea880f58c9caa49e31c166bb3bd6bbf14e21':
  Use separate flags for enabling hardware and software auto-brightness.