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<https://github.com/RTimothyEdwards/open_pdks/pull/312|#312 gf180 PVT corner and exclude list update>
Pull request opened by <https://github.com/vijayank88|vijayank88>
Signed-off-by: vijayank88 <mailto:paruthi143@gmail.com|paruthi143@gmail.com>

Based on ORFS <https://github.com/The-OpenROAD-Project/OpenROAD-flow-scripts/blob/master/flow/platforms/gf180/config.mk|config.mk> update OpenLane flow `config.tcl`.

Also updated `drc_exclude.cells` and `no_synth.cells` to remove `*_1` cells based on <https://github.com/The-OpenROAD-Project/OpenLane/issues/1493|The-OpenROAD-Project/OpenLane#1493>.

cc/<https://github.com/RTimothyEdwards|@RTimothyEdwards>
<https://github.com/RTimothyEdwards/open_pdks|RTimothyEdwards/open_pdks>

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