Add experimental Raspberry Pi support

[kkebo]

closes #4827, closes #2574, closes #6546

I added experimental Raspberry Pi support to UTM. Localization strings are translated by an LLM, so they may contain mistranslations.

Changes:

• Added support for using the Raspberry Pi board's built-in framebuffer as a display
• Removed default PCI devices from raspi* machines by default to avoid crashes
• Added support for each machine constrained to fixed-size memory to avoid crashes

Test:

I verified that my hobby OS for Raspberry Pi 4 could boot with raspi4b.

#4827 (comment)

To do (This is why this PR is still a draft):

• (iOS) Fix the crash when there is no display device
• (iOS) Fix the issue where serial output won't be displayed until restarting a VM
• (macOS) Fix the issue where serial output won't be displayed if a display device is attached
• (iOS/macOS) Fix the issue where the display is occasionally blacked out
• Test on macOS