#ifdef for ICS Audio Blob compatibility

see hardware/libhardware/include/hardware/audio.h, get_presentation_position is not defined when ICS_AUDIO_BLOB flag is enabled

Change-Id: Ib3d99e9637c5d8e1243c5d49d5bdb2c034bc2a41
Add missing functions and signatures for older OMX video libs compat

Nvidia OMX libs need these to work
That fixes hardware OMX video codecs + Camera on TF101

Change-Id: I0de990ee22e4f4c72c5cbb1f7fd96b899d3ecbee