drivers: nrf: avoid UARTE pm infinite loop
drivers: nrf: avoid UARTE pm infinite loop

If there is a UARTE receive error (e.g. framing or break), the RXTO
event may never come.  Check error event too, to avoid an infinite loop.

Signed-off-by: Jim Paris <1cd02e31b43620d7c664e038ca42a060d61727b9@jim.sh>

galak/zephyr,finikorg/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,galak/zephyr