drivers: serial: esp32: Fix syntax error in file uart_esp32.c
drivers: serial: esp32: Fix syntax error in file uart_esp32.c

Added missing comma. Made it impossible to compile a number of examples.

Signed-off-by: Francisco Igual <c0b4f434748d3dc3e17a8c0e2ec410e169da8f8e@ucm.es>

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