feat(PeriphDrivers): Add Ability to Set UART Pin Mapping for MAX32672

[Jake-Carter]

Description

Closes #733

Adds MXC_UART_SetPinMapping and MXC_UART_GetPinMapping for the MAX32672, and pin definitions to pins_me21.c.

Setter should be called before UART_Init...

MXC_UART_SetPinMapping(MXC_UART0, MAP_B);
MXC_UART_Init(MXC_UART0, ...);
// ...

Also fixed UART2A mapping being incorrect. It was pointing to UART2B...

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• PR Title follows correct guidelines.
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[sihyung-maxim]

Merge from main, should fix the Verify Register/SVD workflow.