hlte: Add PowerHAL extension

 * Manage power for the touchscreen, touchkeys, and gpio-keys

Change-Id: I7e5a38f16c0b27815ea0ed6c730ced80dda4869f
hlte: Disable some unused audio features

Change-Id: I2ad24ec8439e2e03236e963fda436f7a40ecbcaa