Documentation: CMake preset names are outdated

[jan-bruckner]

References to s32k148-gcc (does not exist anymore) should be replaced by s32k148-freertos-gcc or s32k148-threadx-gcc

References to s32k148-clang (does not exist anymore) should be replaced by s32k148-freertos-clang or s32k148-threadx-clang

References to posix (does not exist anymore) should be replaced by posix-freertos or posix-threadx