uart/driver: Add module reset before enabling
uart/driver: Add module reset before enabling

This commit prevents infinite restarts caused due to an interrupt flag
was left uncleared.

Closes: https://github.com/espressif/esp-idf/issues/1981

Closes: IDF-188

espressif/esp-idf,espressif/esp-idf,espressif/esp-idf,espressif/esp-idf