feat(core): Add option to support chip variants

[me-no-dev]

This pull request introduces support for selecting and building against different ESP32P4 chip variants, improving flexibility for board configuration and toolchain compatibility. The changes primarily add a new "Chip Variant" menu option, update build variables to use the selected chip variant, and ensure the correct SDK paths are used during compilation.

Board configuration enhancements:

• Added a new Chip Variant menu option in boards.txt to allow users to select between different chip variants for ESP32P4 boards.
• Defined specific chip variant options (prev3 and postv3) for ESP32P4, with corresponding build flags and CPU frequencies.

Build system updates:

• Introduced the esp32p4.build.chip_variant variable in boards.txt for more precise board configuration.
• Updated platform.txt to use {build.chip_variant} instead of {build.mcu} for SDK paths, ensuring the correct libraries are used for each variant.
• Added build.chip_variant={build.mcu} to platform.txt to propagate the chip variant setting through the build process.

Depends on espressif/esp32-arduino-lib-builder#333

[github-actions]

Warnings

⚠️

Some issues found for the commit messages in this PR: the commit message "add Chip variant to pioarduino-build.py (#12037)": summary looks empty type/action looks empty Please fix these commit messages - here are some basic tips: follow Conventional Commits style correct format of commit message should be: <type/action>(<scope/component>): <summary>, for example fix(esp32): Fixed startup timeout issue allowed types are: change,ci,docs,feat,fix,refactor,remove,revert,test sufficiently descriptive message summary should be between 10 to 72 characters and start with upper case letter avoid Jira references in commit messages (unavailable/irrelevant for our customers) TIP: Install pre-commit hooks and run this check when committing (uses the Conventional Precommit Linter).

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[me-no-dev]

@P-R-O-C-H-Y also removed the CPU freq selection menu, because it makes no sense anymore

[P-R-O-C-H-Y]

LGTM