[hdl] Add edge sensitivity and async reset option to edge detectors.
This is necessary in order to properly "emulate" the previous implementation
of the gc_sync_ffs module.
Furthermore, a "new" module has been introduced, the gc_edge_detect, which
combines positive and negative pulse edge detection. gc_negedge and gc_posedge
have been rewritten to use internally the new gc_edge_detect.
Signed-off-by: Dimitris Lampridis <dimitris.lampridis@cern.ch>
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