Remove Unused Code and Preprocessor Directives in RP2040 Port #3100

Job	Run time
GNU MSP430 Toolchain	1m 44s
WIN32 MSVC	3m 40s
GNU ARM Toolchain	2m 56s
GCC MicroBlaze Toolchain	4m 44s
WIN32 MingW	3m 54s
Native GCC (macos-latest)	3m 6s
Native GCC (ubuntu-latest)	1m 28s
CMake Example with Native GCC	48s
	22m 20s

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