AudioResampler: Add resampler using Speex library

The output quality with SPEEX_QUAILTY is better than with HIGH_QUALITY setting
due to a proper anti-aliasing filter.

Original author is Jyri Sarha <jsarha@ti.com>, I've just ported it to Lollipop
and added a few small fixes.
stagefright: FLACExtractor: Add 192kHz support for OMAP_ENHANCEMENT/OMAP_TUNA.

With the Speex resampler, it doesn't care if the input sample rate is more than
twice the output sample rate. As a result, 192kHz FLAC plays fine. I presume
that's why this restriction was in place.
stagefright: FLACExtractor: More freedom for OMAP.

Not that we don't outclass everybody else in this respect already.