GPLv3 Headers

As an extension of PDroid (licensed under GNU GPLv3) these fall under the GPL
license. This is to affirm that fact and preserve attribution before too many
copies are let loose.

Change-Id: I5816d71d0af0649532fc71cb34920765135d99bb
Merge branch 'jb-mr1-release-openpdroid-devel' of github:wsot/platform_frameworks_base; branch 'jb-mr1-release-openpdroid-devel' of github:OpenPDroid/platform_frameworks_base into jb-mr1-release-openpdroid-devel