only for STM32F769NI-DISCOVERY, porting from mbed OS5 unsupport functions

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only for STM32F769NI-DISCOVERY, porting from mbed OS5 unsupport functions default tip

2019-08-07, by kenjiArai [Wed, 07 Aug 2019 05:33:53 +0000] rev 0

only for STM32F769NI-DISCOVERY, porting from mbed OS5 unsupport functions