cpu/esp32: fix and improve UART initialization [backport 2023.01]#19148

bors[bot] merged 5 commits intoRIOT-OS:2023.01-branchRIOT-OS/RIOT:2023.01-branchfrom

gschorcht:backport/2023.1/cpu/esp32/fix_uart_initializationgschorcht/RIOT-Xtensa-ESP:backport/2023.1/cpu/esp32/fix_uart_initializationCopy head branch name to clipboard