libstagefright: Add Dolby UDC decoder support

Add support for ARM based AC3/EAC3 decoder

Change-Id: I63e994fca23479ea9f7c68d5f008eed00cbafffd

Conflicts:
	include/media/stagefright/MediaDefs.h
	media/libstagefright/Android.mk
	media/libstagefright/omx/Android.mk
libstagefright: Additional UDC software decoder support
patches

This is principally to allow merging into CAF. AC3/EC3
mime-type definitions removed to prevent duplication.

Change-Id: I09847a09b0f0780798a82cff7b31b2207c267769

Conflicts:
	include/media/stagefright/MediaDefs.h