Add sonic port_config file for DellEMC-S5212f-P-25G

[osfrickler]

No description provided.

[sourcery-ai]

Hey - I've left some high level feedback:

• The DellEMC-S5212f-P-25G.ini port map skips logical ports (e.g. Ethernet13–15 and 17–19); please confirm this numbering matches the actual SONiC SKU and hardware layout expectations for this platform.
• There are trailing spaces and inconsistent alignment in the new DellEMC-S5212f-P-25G.ini entries (e.g. after speeds), which can be cleaned up to match the formatting style of existing port_config files.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The `DellEMC-S5212f-P-25G.ini` port map skips logical ports (e.g. Ethernet13–15 and 17–19); please confirm this numbering matches the actual SONiC SKU and hardware layout expectations for this platform.
- There are trailing spaces and inconsistent alignment in the new `DellEMC-S5212f-P-25G.ini` entries (e.g. after speeds), which can be cleaned up to match the formatting style of existing port_config files.

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