Gregory Nutt d5cdab0e51 Revert "HSI should not be turned off"
This reverts commit 4e051c05fb8ec61e87b5747f17b667e65ecc2e23.

This change broke the STM32 seril driver.
2017-01-12 16:27:04 -06:00
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2017-01-12 16:27:04 -06:00