[Mbed] -Wundef failures in rc/platform/mbed/Logging.cpp

[bzbarsky-apple]

Reproduction steps

Turn on -Wundef. https://github.com/project-chip/connectedhomeip/actions/runs/6421642409/job/17436462886?pr=29582

INFO    ../../../src/platform/mbed/Logging.cpp:102:5: error: "MBED_BSD_SOCKET_TRACE" is not defined, evaluates to 0 [-Werror=undef]
INFO      102 | #if MBED_BSD_SOCKET_TRACE
INFO          |     ^~~~~~~~~~~~~~~~~~~~~
INFO    ../../../src/platform/mbed/Logging.cpp:109:5: error: "MBED_DEBUG" is not defined, evaluates to 0 [-Werror=undef]
INFO      109 | #if MBED_DEBUG
INFO          |     ^~~~~~~~~~

@pan-

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