fix(boards): fix Manta M8P V2 SPI pin definitions

[tg73]

Updated hardware pin configuration for the BTT MANTA M8P board, correcting SPI pin mappings for stepper controllers.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 1571495 and 7b8f88a.

📒 Files selected for processing (1)

• configuration/boards/btt-manta-m8p-20/board-definition.json

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Walkthrough

Updates SPI pin mappings in the Manta M8P board configuration, changing motor and stepper pin assignments from the PC12/PC11/PC10 group to the PG6/PG7/PG8 group across eight motor channels and stepper software SPI sections.

Changes

Cohort / File(s)	Summary
SPI Pin Configuration configuration/boards/btt-manta-m8p-20/board-definition.json	Updated spi_software_mosi_pin, spi_software_miso_pin, and spi_software_sclk_pin mappings from PC12/PC11/PC10 to PG6/PG7/PG8 for MOTOR1–MOTOR8 and stepperSPI sections.

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 accurately summarizes the main change: correcting SPI pin definitions in the Manta M8P V2 board configuration file.
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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