Combined the new MAX32 MUSB implementation with the existing (TI) implementation to provide generic code base for working the MUSB DCD peripheral.
- Added abstraction calls for FIFO setup, EP registers, Ctrl registers and interrupt setup.
- Combined TM4C and MSP432E into a single header file.
- Created musb_max32.h, and removed the MAX32 specific C implementation.
- Updated MAX32 build system to use dcd_musb.c.
- Added MAX32 conditions for cdc_dual_ports example descriptors missed during first testing.
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