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If MR_DEVICE_SPECIFIC_VERSION is set in BoardConfig, it will
override the VERSION_DEV_FIX which is set in multirom/version.h

Background Info (from version.h):
For device-specific fixes. Use letters, the version will then be like "12a"

(cherry picked from commit ce3f8dd244a2ecf2afc0722d75b105497216ef08)