arch/arm/stm32h7: dma and serial: add TRBUFF flag. #4331
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Summary
A bitfield TRBUFF had appeared in revision 7 (26 Feb 2020) of the Reference manual. It has the following note:
"This bit must be set to 1 if the DMA stream manages UART/USART/LPUART transfers"
Impact
Some stability issues can occur if not set this bitfield when working serial over DMA.
Testing
Custom board stmh7f743