v2x: Disable dsp_xxx_registered tests.
v2x: Disable dsp_xxx_registered tests.

Currently fail with;
```
utils/vlog/tests/dsp_inout_registered/dsp_inout_registered.arch.merged.xml:-1
<pb_type> 'dff' timing-annotation/<model> mismatch on port 'd' of model
'dff', port is a sequential input but has neither T_setup nor T_hold
specified
```

Signed-off-by: Tim 'mithro' Ansell <b1c1d8736f20db3fb6c1c66bb1455ed43909f0d8@mith.ro>

SymbiFlow/python-symbiflow-v2x,SymbiFlow/python-symbiflow-v2x