This macro expands to DT_STRING_TOKEN if property exists, otherwise
falls back to default value.
Helpful when a non-required enum binding doesn't mention a default
value, but a default value makes sense to be set in the code.
Including DT_INST_STRING_TOKEN_OR and test code.
Signed-off-by: Bernardo Perez Priego <bernardo.perez.priego@intel.com>
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