The sinc filter offset was incorrectly handled. Since it perfectly compensates
for the analysis offset, nothing has to be done.
Also, the preemphasis memory was never initialized.

Gets us about 2x speedup on x86

Controls whether deep PLC is enabled

Shift computation to concealment

No dependency on the data files if no DNN code enabled

And references to nnet_data.h

Signed-off-by: Jean-Marc Valin <jmvalin@amazon.com>

Signed-off-by: Jean-Marc Valin <jmvalin@amazon.com>