DAC fixes#1326

Merged

fpistm merged 2 commits intostm32duino:masterfrom

ABOSTM:DAC_FIXES

Mar 16, 2021

Commits on Mar 15, 2021

DAC: STM32F3 dac may have output switch instead of output buffer
ABOSTM
committed
DAC: remove HAL_DAC_DeInit to avoid other channel deconfiguration
ABOSTM
committed