New SBC analysis filter function to replace current broken code

This code is heavily based on the patch submitted by Jaska Uimonen.
Additional changes include preserving extra bits in the output of
filter function for better precision, support for both 16-bit and
32-bit fixed point implementation. Sign of some table values was
changed in order to preserve a regular code structure and have
multiply-accumulate oparations only. No additional optimizations
were applied as this code is intended to be some kind of "reference"
implementation. Platform specific optimizations may require
different tricks and can be branched off from this implementation.
Some extra information about this code can be found in linux-bluetooth
mailing list archive for December 2008.

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