Revert "hlte: disable keystore for now."

This reverts commit a381b5bb107814a2429c1671597d51e3e0307ce3.
hlte: remove logwrapper for irsc_util
hlte-common: wifi: remove old cruft
Hlte-common: Enable home button wake overlay
Merge remote-tracking branch 'Temasek/cm-12.0' into cm-12.0-Exp