u8500-common: Audio changes

AudioRouting fix by marcin https://github.com/marcin1147/android_device_samsung_golden/commit/99f5264a0718f40f23e51fa430ac5fd486b1be0e slightly modified since we don't have a tms module
OMX init.d script to symlink ste_omxcomponents/* to /system/lib at boot (hopefully)
We also copy the audio_policy.conf to /system/etc/ for compatibility purposes