Correct MMCME_ADV in tcl filter statement.
Correct MMCME_ADV in tcl filter statement.

This likely doesn't affect the output, but it prevented params.json from
being valid.

Signed-off-by: Keith Rothman <1bc19627a439baf17510dc2d0b2d250c96d445a5@users.noreply.github.com>

SymbiFlow/prjxray,SymbiFlow/prjxray,SymbiFlow/prjxray,SymbiFlow/prjxray,SymbiFlow/prjxray