Add Winc1500 pins

[kaidokert]

Summary

Added a cargo feature for the board variant with Winc1500 chip and corresponding pins.

Checklist

• CHANGELOG.md for the BSP or HAL updated
• All new or modified code is well documented, especially public items
• No new warnings or clippy suggestions have been introduced - CI will deny clippy warnings by default! You may #[allow] certain lints where reasonable, but ideally justify those with a short comment.

If Adding a new Board

• Board CI added to crates.json - not applicable here as this is a board variant, not a new board
• Board is properly following "Tier 2" conventions, unless otherwise decided to be "Tier 1" - i think it is?

If Adding a new cargo feature to the HAL

• Feature is added to the test matrix for applicable boards / PACs in crates.json ( unsure how to actually add a BSP/board feature into the matrix )

[kaidokert]

Thanks for merge !