Add buzzer macros to pindefs

[NArmistead]

Description

Add TIM2 and its channel 4 to rev3 pindefs

Issue Link

Parent (FCF): SunDevilRocketry/Flight-Computer-Firmware#290

Testing

• Passes existing unit tests
• Unit tests modified (link the test changes as a child PR)
• Integration test performed

N/A

Reviewer Checklist

Standards

• Follows FCF Architectural Standards
• Follows SDR Coding Standards
• Code complexity/function Size is minimized
• Code is testable
• Code is readable and commented properly
• License terms are respected

Error Handling

• Potentially unsafe functions return a status code
• Error returns properly handled

Memory

• Stack allocated memory is scoped correctly
• Heap allocated memory is avoided
• Globally allocated memory is minimized except when necessary
• Pointers are used correctly
• Concurrency has been considered

Performance

• Rate limiters are respected
• Busy waiting is avoided
• "Delay" calls are not used in performance sensitive code

[NArmistead]

wtf is going on