flacdsp_lpc_template: add comment to explain the CONFIG_SMALL code

I found the optimisation of 2 samples per iteration obscured the
underlying algorithm.  I had to write it out on paper and translate into
a mathematical sum to see that the two samples are unconnected.  I hope
that if anyone else is struggling to understand the code that this will
be useful.

Reviewed-by: Christophe Gisquet <[email protected]>
Signed-off-by: Michael Niedermayer <[email protected]>

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