Inputs should have antenna diodes

[mattvenn]

Description

Inputs should by default have antenna diodes to protect them during fabrication.

Environment

Kernel: Linux v5.13.0-40-generic
Distribution: ubuntu 20.04
Python: v3.8.10 (OK)
Container Engine: docker v20.10.7 (OK)
OpenLane Git Version: -dev
pip:click: INSTALLED
pip:pyyaml: INSTALLED
pip:venv: INSTALLED
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PDK Version Verification Status: OK
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Git Log (Last 3 Commits)

e4bfdd7 2022-02-22T16:59:14-03:00 Remove pip install, no longer needed (#953) - Vitor Bandeira -  (grafted, HEAD, tag: 2022.02.23_02.50.41)

Reproduction Material

run the flow on any example design and examine the input ports.

Expected behavior

Antenna diode should be added next to inputs.