Update serial_api.c for ARM tests#1865

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bcostm wants to merge 7 commits intoARMmbed:masterfrom

bcostm:pr/n1833_ohagendorf

Commits on Jun 2, 2016

[NUCLEO_F7xx] typo in target names for travis build
ohagendorf
committed

Commits on Jun 6, 2016

[NUCLEO_F767] adding gccarm and uvision5 exporter
ohagendorf
committed

Commits on Jun 7, 2016

Add call to SystemCoreClockUpdate() and Reset peripheral before init phase.
bcostm
committed