[headers] Added droid-util headers for 4.4

Copied from droid-util-42.h
[util] Recognise AUDIO_DEVICE_OUT_PROXY
[util] Add AUDIO_DEVICE_OUT_PROXY in output device conversion table
[util] Recognise AUDIO_OUTPUT_FLAG_COMPRESS_OFFLOAD, AUDIO_OUTPUT_FLAG_NON_BLOCKING
[util] Recognise AUDIO_CHANNEL_IN_FRONT_BACK
[util] Do not fail while parsing speaker_drc_enabled entry in audio_policy.conf

Fixed parsing following section in /system/etc/audio_policy.conf

global_configuration {
  attached_output_devices AUDIO_DEVICE_OUT_EARPIECE|AUDIO_DEVICE_OUT_SPEAKER
  default_output_device AUDIO_DEVICE_OUT_SPEAKER
  attached_input_devices AUDIO_DEVICE_IN_BUILTIN_MIC|AUDIO_DEVICE_IN_BACK_MIC|AUDIO_DEVICE_IN_REMOTE_SUBMIX
  speaker_drc_enabled TRUE
}
[util] speaker_drc_enabled is only from HAL v2

Signed-off-by: Simonas Leleiva <simonas.leleiva@jollamobile.com>