Remove Unused Code and Preprocessor Directives in RP2040 Port (#1324) #3101

Job	Run time
WIN32 MSVC	3m 20s
WIN32 MingW	4m 20s
Native GCC (ubuntu-latest)	1m 35s
CMake Example with Native GCC	41s
GNU ARM Toolchain	3m 21s
GCC MicroBlaze Toolchain	5m 3s
Native GCC (macos-latest)	3m 29s
GNU MSP430 Toolchain	1m 34s
	23m 23s

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