Revert "av: Don't use fraunhofer for ARMv6 devices"

This reverts commit 47d3e5ff354c1355472e5964f25f8b30157389f8.
Revert "Revert "Remove the no longer used PV software aac decoder.""

This reverts commit 9b9531a005f921b6cbf4634a7c48c01703a94423.

Conflicts:

	media/libstagefright/codecs/aacdec/Android.mk