drivers: uart: fix esp32 TX checks
drivers: uart: fix esp32 TX checks

This fixes both TX ready and completed uart
calls to meet valid condition.

Closes #41526
Closes #41624

Signed-off-by: Sylvio Alves <bd63183a3ab542e2b25ff1e90971d4881e1bdbe5@espressif.com>

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