Add RJ9_Evercom_5301-4P4C footprint (repush of !3016)
Repush of !3016 (closed): Add RJ9_Evercom_5301-4P4C footprint
Addressed review comments from earlier MR:
- Silk outset from fab layer
- Remove copper layers from mechanical holes
- Add datasheet to descriptions (and tab down to keywords)
- 6 -> 7 in model path
Also rounded the square pad.
KLC looks clear.