[rtl] minor edits of FIFO module #408
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add "gated" output option - force read data to all-zero if no valid data available (=FIFO empty)
dummy-assign unused signals
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The NEORV32 FIFO component now provides an "output gate" option. If enabled, the output data is forced to all-zero if no valid data is available (= FIFO is empty).
Since the FIFO memory (block RAM) does not have a reset, this option can be used to ensure the output data is always defined.