feat(fix): Pinout on M8P V2

[3dprintpt]

Corrections on Manta M8P V2 spi pins

Summary by CodeRabbit

Release Notes

• Chores
  • Updated hardware pin configuration mappings for motor and stepper interfaces on the Manta M8P board.

[coderabbitai]

Walkthrough

SPI pin mappings in the board configuration file for BTT Manta M8P-20 were updated. All motor and stepper SPI pins were remapped from the PC12/PC11/PC10 port to the PG6/PG7/PG8 port consistently across all affected motor and stepper entries.

Changes

Cohort / File(s)	Summary
Board Configuration SPI Pin Remapping configuration/boards/btt-manta-m8p-20/board-definition.json	Updated SPI pin assignments for MOTOR1–MOTOR8 and stepperSPI from PC12/PC11/PC10 (MOSI/MISO/SCLK) to PG6/PG7/PG8 pins. All other configuration fields remain unchanged.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title refers to a pinout fix for M8P V2, which directly aligns with the PR's objective of correcting SPI pins on the Manta M8P V2 board configuration.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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