chore(Boards,MAXUSB,MiscDrivers,PeriphDrivers): Fix most IAR build errors and warnings for MAX32690

[sihyung-maxim]

Description

This PR fixes all build errors and most build warnings. The remaining build warnings are: 1) linker file/flash loader related between IAR and GCC in the SEMA PeriphDrivers, and 2) not explicitly defining the order of volatile access.

The purpose of this PR is to prep the MAX32690 for the IAR new project package.

These changes are compatible with GCC as most warnings are due to unreachable blocks that GCC doesn't catch, or IAR's sensitivity to casts.

Checklist Before Requesting Review

• [ ] PR Title follows correct guidelines.
• [ ] Description of changes and all other relevant information.
• [ ] (Optional) Link any related GitHub issues using a keyword
• [ ] (Optional) Provide info on any relevant functional testing/validation. For API changes or significant features, this is not optional.

[sihyung-maxim]

/clang-format-run