Hlte: audio: play silence on boot

Replace silent.wav to your boot audio but filename must
remain silent.wav to play audio on boot.
hlte: remove scheduler settings during boot
hlte-common: update hardware key / hardware wake keys overlay
hlte-common: Use normal case for Carrier Text in LockScreen.
hlte-common: Fix hardware video playback

Depends on:

mm-video-v4l2: vdec: only streamoff while freeing if target allows it
https://github.com/temasek/android_hardware_qcom_media/commit/d47b2e242c8279c84f633c5bfc507064f1325307