drivers: modem: gsm: +CGATT shouldn't give sem_response & set error
drivers: modem: gsm: +CGATT shouldn't give sem_response & set error

The +CGATT: is followed by 'OK' or 'ERROR', so its handler
should not set error code and give sem_response.

Signed-off-by: Yong Cong Sin <d1951b00420cc51c2da597170bb83d89fa46ae3b@gmail.com>

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